biggest thing to consider is how much power you regularly have available, as some blinder packs can draw LOTS, second consideration is budget
we have a bunch of 8x DWE650 packs that live around 45a each! They're bright as can be, and 4 channels which allows for some cool effects, but realistically they're too big for most venues
I like some of the MR16 and MR20 stuff, the power draw is a lot lower and they still have that tungsten feel
lots of the new LED stuff is too fast for me in terms of on/off time. With blinders I want there to be a bit of a fade out when I take my finger off the flash button, something more natural than the instant off of a LED. Unfortunately the only real way to get this is with a big power sucking bulb.
there's very few fixtures I prefer as 'conventional', but blinders are one of them...ACLs being another