Hmm. Let me put on my barstool psychology hat for a minute. You're clearly not a front runner. You like teams with ups and downs. You do like to win though, that's clear too. Cardinals fans are very tribal, which is a big part of European football. At first blush, you do not strike me as a City or United fan.
You really can't go wrong with any one of Arsenal, Tottenham, or Liverpool. All three play attractive brands of football. All three have good/great managers. If an American angle is what you want, Chelsea is probably the way to go. I'd read the threads of all 4 and see who you like best/most.
But, look, all bullshit aside: Liverpool is the best club in the world. People here won't admit it but everyone, especially @sidis, knows it in their hearts. I honestly can't see how anyone roots for any other club. Best fans. Best kits. Best stadium. Best manager. Best fucking songs of all time. Great history. Plus, 6 Times!