I had to look up where the
Andamans were! How is the diving over there?
Great you've come and asking us directly for some consumer research
Personally, my thoughts on scuba equipment buying:
Although I'll research a lot online before I buy (user reviews mainly), I'll always want to try something on in a shop before I buy. I'm more willing to pay a little extra to shop offline, so I won't be trying things on in a shop then go and buy it for £5 cheaper online.
So, location wise it's just got to be somewhere local to me. Just about the only thing I'll buy online will be things such as spare parts kits, dive watches etc.
Brand wise, I'm sure lots of people will specifically have their own brands, but it's a bit like shoes for me. I'll go with what fits and what I'm comfortable with over brand.