I have looked around and was overwhelmed by the number of Munchkin base sets out there. I googled what the best Munchkin set is, but so far, all I found is that I should pick the theme I like best. But I'm not sure if there might be other factors.
In reality I'm looking for the answer to the question: what Munchkin set is the best in terms of card functionality, bad stuff, and surprising and interesting turnouts? Or is the gameplay broadly similar between them and the theme is the only big difference?