3 or 4 Cree XR-E R2 MR11 kit??????

Hi all,

I'm about to order my LED'a for my custom cannister light, first off some background info so u know what i'm working with.
14.8V 4000mah LiPo battery
Custom Aluminium Cannister and light head (so no fixed size im up for idea's)
pretty much the rest is Salvo parts (glands, latches etc)

NOW my question,
I'm planning on ordering a Cutter MR11 Cree XR-E Kit but i cant decide whether to get the 4 LED kit or the 3 LED Kit, Even though the optics are apparently 4deg for both i would guess due to there being more room the beam may be a little better from the 3 LED one compared to more light but worse beam from the 4 LED kit

Just looking for thoughts, comments and ideas

I would like to keep the whole thing fairly small but if u have ideas that are way better but bigger please still feel free to share as u may convince me to go larger


Thanks in advance,
Bradley