That's not asking a simple question that's like asking me my favourite child!
Among my favourites (in chronological order) are:
Tow George stephanopolous (I've got magic beans)
Tow the boobies (I've a soft spot for the French farce element)
Tow the fake Monica (first appearance of drunk Monica - always fun)
Tow the birth (still find phoebes interruption in the closet so moving)
Tow the baby on the bus (dds favourite and I love hearing her laugh)
Tow the prom video ("he's her lobster" and first flashback episode)
Tow the 2 parties (love the Underground Railroad ref and chandler and Rachel bonding - think they should have done more with that pairing)
Tow no ones ready (a classic that came about to save money)
Tow the flashback
Tow chandler in a box (monicas monologue in response to criticism about dating Richards son)
Tow all the kissing (I loved chandler and monicas early relationship stuff)
The one hundredth (so moving when Phoebe saying goodbye to the babies)
Tow all the thanksgivings (first time chandler says I love you to Monica)
Tow all the resolutions (again especially chandler but Ross a close second with the leather pants)
The ones in Vegas (pre binge days where a season finale meant we had to wait bloody 6 months till we found out what happened next! I remember literally as the end titles rolled sitting 😱 for a good few mins)
The one where Ross got high (so satisfying for Ross to come unstuck with his parents and temporarily lose gc status)
The ones with the proposal
Tow the holiday armadillo
Tow all the cheesecakes (as I say I've a soft spot for chandler and Rachel)
Tow they're up all night (I do like the ones where it's just the main cast)
The ones with Monica and chandlers wedding (I so did not see the twist on first viewing)
Tow the videotape
The ones where Rachel has a baby (since divorcing myself I so feel for Janice in these ones)
Tow the cake (Emma's first birthday)
Tow the late thanksgiving (love when Monica doesn't gaf it's been ruined cos they're getting a baby)
Tow phoebes wedding
The last ones (though I wish they hadn't been)
"The one where Joey finds out. YOU... and YOU?!! So good" I love that Joey who's meant to be the least intelligent is the ONLY one who susses it out
"Phoebe joining in with the bagpipes, you can see Jennifer Aniston trying not to crack up" Jen was apparently the worst for "corpsing" and setting the others off - have you seen the out takes? Bloody hilarious
But the one that guarantees me to laugh every time is an otherwise meh episode but for this one scene I love it - tow frank Jr - the entertainment centre for chandlers perfect prat fall over the door, plus his reaction when Joey almost lobotomises him! "No you didn't get me!!...you get me you kill me!!!"
The geller family with the toxic dynamic so perfectly observed is utter genius! I feel sorry for the writer who did that as they have clearly lived through it - even including the ref to history repeating itself at nana's funeral clearly nana was toxic too and yet Ross is so clearly moved when all the sweet n lows fall on him
"Anything episode with Jack and Judy (love the one when they find out Monica is dating Richard!)" it's one of the few episodes where Ross is really on point - removing his dad's baseball bat from his hand and bringing in the birthday cake
Very few episodes I don't like.