only blue is hard. Red has old farms with orderly clusters that you can set up a base near if you want them badly enough. Cloud has giant clusters you can make into a farm or just mark the location. But blue is scattered in the wild and finding a large group is harder.
it is also quite common to find 10 or so red shrooms in one small area, just a little bit of scouting should reveal 2 or 3 spots like that, and its enough for 1. Groups need to work together on those.