What do you use Organic Maps for? Driving directions, walking, hiking, cycling? All of those or something else? It doesn't seem good for hiking because it's missing so many basic metrics that Gaia has (elevation data, different speeds like rate of ascent). I've got a rough impression that it's mostly suited for urban European locales for walking directions, but in the US I only use mapping apps for driving (turn by turn directions) and hiking in mountainous wilderness (as opposed to some places in Europe that had nearly urban "hiking").
I use OrganicMaps / CoMaps for hiking. It has contour lines, it gives an elevation gain graph when you build an itinerary, and does seem to take the elevation gain in account when estimating time. I have not planned complex hiking itineraries with it too.
AllTrails is better for 99% of activities and way easier to use. If you want some kind of uber-specific feature, use case or location, there is usually one app that is better for that (like onX for hunting/fishing, or Yahoo Maps for... Japan)