I'm more of an old fashioned player when it comes to poker. I have ran 4 color decks before and honestly have had less fun playing poker as a result. This is likely because I am so used to the aesthetic of a 2 color deck. Its also nice when you have a suited hand and see all the same colors you have being flopped regardless if you have it or not because it adds to the suspense. Anyways that's just me and beyond aesthetics it doesn't really matter.
I used to use 4 color decks but just recently started using 2 color because it's just easier not to make a mistake when grinding for a long time. Also my sight is not the best 🤓
2 colours for me as I am colour blind so I am used to looking for suit symbols to distinguish hearts from diamonds or clubs from spades. Four colours just makes it harder for me to look for the symbols.