I use a Garmin 76CSx on trial rides along with the Garmin Basecamp software. I know that it is not the latest and greatest GPS. However with a few things to consider it is a good one. Being on horseback there is always the danger of dropping it and the newer one have a large touch screen gives you a greater chance of it not surviving the fall. And if you break it it will not break the bank.
I am not sure about the use of the touch screen with gloves so the buttons works well.
I also hang the GPS on the pommel of the saddle buy looping the GPS lanyard through it and over the saddle horn. This allows the GPS to track better and less chance of spending a lot of time and battery power searching for the satellites.
I have spent as much as two weeks in the high country every year with a pack horse and riding horse alone in the San Juan National Forest. This GPS unit has logged hundreds of miles in the back country over the years without issues. I have been caught in rain storms and snow storms and it has never failed me.
James