Hi Stew63
I find that the touchscreen vs buttons choice can be quite a personal preference. For me, the decision was for the Oregon for:
- touchscreen vs buttons
- screen size - larger than the 64s
- smaller (well, shorter than the 64s, even though the 64s is slightly thinner, without the protruding antenna, the Oregon is more pocketable for me)
The battery life of the two are about the same in the standard power saving mode (screen off, GPS recording tracklogs). If you left the Oregon screen on, it does consume more power than the 64s screen on, so you'd get about half the battery life if you left screen on full brightness on both.
As mentioned the size difference without the protruding antenna can be an issue in terms of pocketablility. And the Oregon weighs lighter by some 50g or so.
You'll be used button navigation having come from a 62s, but I really do prefer the touch screen. Once I used the touchscreen to enter coordinates, name waypoints, navigate around the map, I find it hard to go back to my button GPS units.
My Oregon 600 touchscreen works with the various gloves I have - leather palm/fingers and other thin gloves. It can work with ski gloves but is harder to control with thicker gloves.
In rainy conditions I've had no problem with it working in drizzle or light rain, but when the rain drops get big, the bigger drops trigger the touch screen and water on the touchscreen causes "phantom" touches and the touchscreen then becomes a little frustrating to use.
With regard to the new antenna of the 700 series, I have still only heard anecdotal evidence that it is more accurate on horizontal distance when compared with the 600. There was a German forum where someone posted their comparisons of a 700 vs a 600 but I can't find the posts. I recall posts in that forum mentioning quicker GPS signal acquisition but that track logs were not always superior than the older 600 series with still some drift in valleys.
Between the 62s protruding antenna and the internal antennas of the Oregon, I have not noticed any discernible difference in accuracy in actual use. I haven't had a chance to play with an Oregon 700 or 64s in detail though, but I don't suspect the accuracy will be too far from the 62s. I have had no problems using my Oregon 600 under tree cover. I am happy with the time to first fix on my 600, and I believe that both the 700 and 64s are faster.
On to the new operating system on the 700s - I am less a fan of it, probably because I'm used to the "Classic" menu styles. You can switch back to a "classic" menu style on the 700 series, but the Profiles mode has been altered quite a bit so it takes a few more steps than it did on the 600. Coming from a 62s you might find it quite a change as well.
Interestingly the default setting on the 700/750 is to save tracks in the FIT format (stored in the activity log rather than the track manager). FIT files are handy if you have the various fitness sensors connected up and want to upload the data to an online fitness portal, but GPX is really the way to go for navigation. I'm not sure if this has been addressed in recent firmware releases, so if you go down the 700 path, remember to change the Output format to Tracks (GPX/FIT).
One other thing to note on the 700s is that some people have reported that 2 fingered pinch to zoom does not work well when the unit is not being held (like on a table or mounted on a bike). You can still use the +/- to zoom in/out. Not sure why this is.
For you maps query, the 750T comes with the Garmin Topo Lite (AU/NZ) instead of the full Topo version. I am assuming it is the V5 (latest September 2014 data). The Topo Lite version has 40m contours vs the 10m contours of the full version. The Lite also doesn't do auto-routing, although that might not be a concern for you. Be aware that the V5 maps also seem to have introduced some errors - see
viewtopic.php?f=63&t=22557.
I still recommend buying the unit and maps separately. The 750 does have slightly larger internal memory. Garmin Maps can be bought on DVD and you license it to your Device serial number, but have to install it to your own microSD or Device yourself via a PC. It can be sometimes cheaper to get the DVD version than a pre-installed microSD card. If you buy the pre-installed microSD you can pretty much just plug and play, but the maps are linked to that microSD card so you can drop that microSD card to any other Garmin GPS and it should work, but you are unable to copy the map files to your another microSD card.
Another map option is the more expensive Oztopo V8 preinstalled on a microSD card. Or you can use OSM maps which I currently also have on my Oregon.
And price might be an issue for you as well. The Oregon 700/750 is still priced quite a bit higher than the 64s.
And as always, with new Garmin devices, there will invariably be firmware issues. The Oregon 700 is on v2.80 as at December 2016. In comparison the Oregon 600 finished at V5.00 in July 2016 - but between v2.80 adn v5.00 there were at least 15 firmware updates not including withdrawn updates. These were mostly bug fixes that users had reported. Some updates introduced more bugs while fixing others.
Not sure if I have helped or confused you even more.