For this I have a massive area, about 200km x 200km which is a 1.5GB download, predownloaded on my phone so my entire region is already in my phone at all times. Predownloading map data for an area before going there is key. Gaia does have a slope angle overlay but I rarely use it as I feel like I'm getting the same data resolution by just looking at contour density. I've used Fatmaps a bit for 3D slope visualization, but it hasn't presented much in the way of advantages over Google Earth so GE is still my go-to 3D visualizer for planning in advance. We use SARtopo (the professional Caltopo platform) for SAR calls but on my own I always use Gaia. I teach search and rescue here in BC and personally I use Gaia GPS for all my backcountry navigation. I also use it to see exact slope angles and very occasionally I use CalTopo to convert gpx to kml and vice versa when different apps require different things (and to strip out the timestamps in my gpx files for Google Earth archival). I use Strava for stat aggregation and feed-based activity viewing. I use a fenix7 for watch-based navigation and recording GPS logs. I use GeoTracker for recording my GPS logs. I use Backcountry Navigator for phone-based navigation.
I use Google Earth for exploration, archival and route creation.
It's definitely the best and I've tried CalTopo plenty of times but just try to load in 8500 tracks and see what a brick it shits. and I can switch over to multiple satellite images any time. I've been using it for years too, especially the USGS with the slope angle shading overlay - then I've got all my hiking and skiing trails loaded in. This is the best answer here but it's not marketed like CalTopo so nobody realizes it exists.
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