to the op: many persons stating "thing a is better than thing b" don't intend to start a discussion, they want to start a fight. the correct term nowadays for that is "trolling", it's best not to feed them
btw, some good hints to detect such a troll:
1. trolls don't ask something, they begin with a polarising black or white statement. any options beyond these given two are ruled out from the start (that's btw a very old rethorical stylistic device called "tertium non datur", so technically already the romans had their share of trolls
2. a troll completely disregards some arguments of your reply, it only reacts to those parts, that allows it to continue the trolling. if your reply is impossible to counter, it will most likely start to insult your signature or avatar.
3. trolls pull arguments out of thin air, they love to cite unverifiable or imprecise sources or don't state a source at all. so, watch out for "some say...", "surveys show..." or "it is known that..."
4. a troll will almost never state something as its opinion, everything, even the most individual belief or attitude, will be repackaged as a fact.
so whenever something like this "thing a vs. thing b" is mentioned, go back one step and ask yourself: is this comparison even useful? or is the real intention of the other person just to provoke me? and back to this topic: i don't think that such a rather superficial comparison of pcsx2 and dolphin is useful in any constructive way. it's nice to see the progress of both, that's what matters, right?