The title says it all! Personally, I find the best Floor Trap to be the Wooden Spike Traps, maybe Tar Pits if you're looking to slow your enemies, but Spikes sure do a good job at erasing the enemies quickly in lower levels/if you manage to power 'em up high enough.
Wall Traps.. I've always liked the Broadsides, being able to have a Trap that just shoots bouncing projectiles is pretty neat for tunnels, maybe on rare occasions a Wall Launcher if the Husks fall into a hole or off the map.
As for the Ceiling Traps, it's surely a tie between Gas and Drop Traps. They're both awesome at keeping a huge crowd at bay, but I can never really agree on which one I would pick between them.
I'm making this post more to hear what you'll prefer, but also maybe for anyone looking to know what Traps they'd like to collect/work on more. Side note: DO NOT bother with Spike Traps.
Source: https://www.reddit.com/r/FORTnITE/comments/z8196t/what_do_you_consider_to_be_the_best_trap_of_each/
