flymolo
Contributor
You're going to need 400ft if you want to cave dive.
TDI publishes their standards, but no agency is going to be wildly off track.
Cavern requires 1x 125ft safety reel.
Intro/Full is just an appropriate length of primary. 200ft is enough for a lot of places, but let's just say that the Dive Rite Classic reel is 400ft for a reason. Same that the Halcyon Primary reels start at 400ft in length.
To answer your other question I prefer the Halcyon to the Light Monkey but I actually prefer the Divesoft to both.
The divesoft reels are nice but I really disliked the divesoft line they come with