What type of wire can I use/should use for light controller??

It asks for 6/3 wire for 220v 8 outlet, and 10/2 for a 4 outlet one... my issue is what type of wire do I need??? Romex it looks like what I’m supposed to use?? It’s beyond more pricey than something like Gray Stranded CU UF-B W/G Wire... which is mainly for burial... can I still SAFELY use this?? Or go with a romex?

I'm not an electrician, so take this with a grain of salt, but from my understanding the UF cable is fully waterproof, like you said it can be buried, and is usable in and out doors. "Romex" is a brand name of non metallic sheathed wire and I am pretty sure they only have polymer on the outside, the inner wire wraps are normally paper, so not suitable for outdoor or burying. If it's just a matter of cost I'm 99% sure you can use the UF inside for your purposes. You should probably double check your local wiring codes before you do anything though. Good luck

Question no longer matters lol. I’m running a different setup so yeah. This can be closed out.