Hi Matt
In the Chilli world choice is massive, I really like the taste of Kashmiri Mirch (MDH) and the colour
it gives to the curries. I was freaking a while back, when I couldn't get any.
Deggi Mirch is a close second, but I can live without it. I also like grinding whole dried chillis to see
what flavour I can produce. Mind you, be careful of the vapour if your dry roasting chillis, as you can create TEAR GAS a painful lesson I learned years ago. Ouch!!!
Most Bangladeshi chefs I know, don't have any preference for types or brands of chilli powder, but I have taught two or three about Kashmiri Mirch and they do use it now in their signature dishes, which are expensive and very successful.
cheers Chewy