It's true that it would be nice to have the ability to see the trading volume on Bisq 2 like in Bisq 1 (but I get that it's not the most important feature to implement first). That being said, Bisq 2 certainly has a pretty low volume, since only Bisq Easy is available at the moment. It won't get much traction as long as Bisq MuSig (a trade protocol similar to Bisq 1) isn't available.
No, in fact what I meant was, I would like to see what percentage of people use which of the 2 implementations.
By "market share" I meant for example 80% of people use Bisq 1 and 20% of people use Bisq 2. It's impossible to tell, since a person could use both and nobody would know. But I was just curious.