I've mostly used GaiaGPS and have been playing with CalTopo. In general, I prefer Gaia for various reasons, but there are a few areas that stand out where CalTopo is better that are perhaps moderately effortful to replicate without breaking the model of Gaia too much.
One is having a more extensive slope angle overlay: glancing at even low-angle slopes (rendered in green-to-white on CalTopo) can be helpful in finding paths through flatter ground. It's too disruptive to leave on all the time for most purposes, so CalTopo's model of having hotkeys to toggle is useful, but not vital.
It's not clear to me if toggling has a sensible translation to how Gaia's UI works (which has a more uniform way in dealing with opacity and layering), but I can put up with something slightly clunkier as long as I have the more robust slope layer.
The other area is latency in path routing and editing. Clicking around CalTopo and tying vertices to trails or drawing off-trail is feels a lot snappier, and path vertices are easier to see and manipulate. I suppose the statistics on route is also pretty nice, e.g. treecover and grade, per https://help.gaiagps.com/hc/en-us/community/posts/4423258382103-Route-Slope-Angle-and-aspect, but if I had to choose one thing, faster and more responsive pathing and snapping would take the cake.
Thanks for Gaia.
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