Favorite season... tough question when I've seen them all, some more than once.
For sheer "something to talk about," I'd have to go with the Jason/Melissa/Molly debacle.
For a charming love story, probably Andrew and Jen. I also liked Byron and Mary and Andy and Tessa. The Byron season was interesting how it started out with two bachelors.
I liked Prince Lorenzo's season, not because of him (dull, and foppish hair), but because of Europe. Same with Doctor Travis and Paris. I thought the princess chick on Lorenzo's season was insane and made for good TV (Erica?). (So funny she hooked up with the "guard and protect my heart" guy, Kasey! :lol).
For Bachelorettes... Trista, of course. Meredith made a great B'ette, but I never got the Ian appeal and couldn't get too excited about their romance because I never believed he'd commit. ;)
Andy & Tessa
Charlie & SarahB
Those two doofi screwed up.
Bachelor: Andrew/Jen (loved Andrew, thought he was a great bachelor considering that he wasn't a re-tread); Byron/Mary (Liked the two bachelors, liked that the original girls didn't click so he got a mulligan with two girls from past seasons); Andy/Tessa (Loved the love story, too bad it didn't last.)
Bachelorette: These are obvious--Trista and Ryan (Loved me some Ryan and they are a great couple) and Ali/Roberto (They are a great couple whose love is almost tangible.)
Did anyone ever watch Joe Millionaire? I thought he had very lovely women (albeit trampy)
I loved Jen and Andrew....she changed so much as bachelorette - so I didn't like her then....seems all good now. Back in Chicago, married and a mom.