It's been said by me and others before, the large bezel IR's emit a large signature.
I just bought a Sniper Hog 38 to replace my old SH 30. I don't think that it is any brighter, it is just larger with more glow. I like the 30mm better but it has been discontinued.
If you can compare, walk out 50 yards and look back at the visible glow from a small, like maybe 30mm, compared to a 50, 66, etc. That might help you decide. The idea with NV is to be discrete, you give a lot of that up with those cannon sized illuminators.