The majority of my plants are grown indoors due to my climate: cold most of the year, short growing season, loooots of heavy rain.
My current combination is 50% Fafard Cactus/Succulent soil*, and 50% perlite. My plants seem happy with the Fafard as a base soil. Only downside I have with it, is it takes a while for water to sink into it thoroughly, but once it goes through, I find it dries faster than some past soils I've used. As a reference, the Fafard is a mix of sphagnum peat moss, humus, sand, perlite and some lime.
*Side note: I wouldn't recommend using the Fafard on it's own. It's finer in texture and I'd be worried about it compacting. Definitely mix a gritty material into it!
All my succulent plants are in unglazed terra cotta pots with drainage (only exception being my larger outdoor mangaves, and a few cactuses that came in plastic pots when purchased and haven't needed a repot yet).
Most of my plants are in this combination, though I have a few that are a bit different. For example, I have a bowl of Graptopetalum paraguayense, and a bowl of mixed Sedums that I potted with the intention of keeping them outdoors as much as possible. I increased the quantity of perlite for these ones because as previously stated, I get a lot of heavy storms, and I wanted them to be able to drain and dry out faster. So far they've been happy.
I have some cactuses outdoors that are in the 50/50 mix currently, but I intend to increase the perlite content when they're repotted next (I have to bring those ones inside once in a while when the storms persist for several days).
I do have a couple exceptions where I went with slightly less perlite as well. I did this for my plants that like a bit more water than the rest of my succulents.
I use perlite as my inorganic component simply due to availability. I can always find perlite, but options like lava rock have been near impossible to find in my area. I found it once recently, and it was selling for $10 for a bag the size of a standard sandwich bag. Which is not cost effective when you have around 200 plants.
