Which dropin from Fasttech?

Hi there.

I need a Dropin for my L2M I ordered 5 minutes ago and since I am going to place an order on Fasttech anyway, I´d welcome getting one from them.
So far so good, but which one should I take? I´ve got THIS (U3, 3 modes) and a 504b with a T6/5 mode. The whole 504b was cheaper than the other dropin alone and I can see no difference in brightness. Well, the one from intl is smoother, but it is in a OP reflector.

I do not want blinky modes, so it should be 3 modes then. And I think I prefer OP reflectors for the smoother beam. And, of course, the brighter the better.

Which one should I order (from fasttech)?

Thank you : )