So I just assumed that these were pretty much the best products in their particular lines.
Popular with people who post website reviews perhaps.
Remo Emperor and Ambassador are just as good and equally popular.
Likewise, Evans G2 are probably more widely used than EC2's.
The message should be, use your own judgement I guess. There are lots of great heads around, including Pinstripes and EC2's.
You can start with a couple of single heads, see how they sound before you splurge on a complete set.
Unfortunately I'm not an Aquarian expert. Several regular posters are though, including Bart.