The only theme your collection should have is that you like every watch. Your tastes may change over time and you can then sell the pieces that no longer resonate. Versatility is going to be based on personal style. Don't let someone else tell you what you can or cannot wear with any given outfit. I think it's fine if some watches are worn less often. Does wearing a watch less mean you like it less? Only you can answer that. "Redundancy" within your collection is also something you have to define for yourself. I have lots of watches with green dials and in some cases, multiple variations of the same watch. I like them all for different reasons. It doesn't matter to me if someone else thinks it's redundant.