Theme. Theme. Theme.
Nostalgia. Nostalgia. Nostalgia.
People will "try" and make cases using logic for why one era has better games than another -- it's completely irrelevant. When it comes to decision-making, emotion (feeling) always trumps logic (ideas), and whatever nostalgia is pulling you to a certain era in time ... that's what you'll collect.
Collect the games from eras that 'call to you', and use logic all you want to help you decide what's best -- your emotions will win every time.
-mof