Pretty open question, whatever reason you find it to be the best. Maybe you're abscessed with a character or a certain artist? Maybe sinking a couple thousand hours into a game was mostly one handed? Who knows.

Personally, I'm a big fan of presenting_hindquarters. rule34.xxx/index.php?page...ng_hindquarters&pid=0
I'm an ass man at heart, and proper presentation is a beautiful thing. On the rare situations when people send out RP requests, especially back when the RP forum was still up, the ones with pictures containing this tag almost always caught my attention.

Special mention to what is essentially a more specific version, the newer praise_da_booty_(meme) tag is a god send from Twitter. rule34.xxx/index.php?page...raise_da_booty_%28meme%29

I don't know which tag I would say it's my favorite, but I do love praise_da_booty_(meme), jack-o_pose, and futanari, for example. The first two are funny meme poses but god are they hot! (and funny). And futanaris are always nice to have~

Futanari is like always first word in my searches. Then most of the time i add piss_drinking, urethral_insertion or urethral_fingering. And for characters mostly draenei from WoW.

wow you're the exact opposite of me

Futanari, Instant_loss_2koma and rape are my top 3 x3

Futanari is always up there, then there's either soles or presenting_feet, and depending on how I'm feeling, sometimes I add hairy or sweat or both. If I'm looking to be really specific with characters I usually like juri han from street fighter and raiden shogun from genshin~

I'm a simple man who loves thiccness. So it's not just one tag, but a couple. I check tags like huge_ass, hyper_ass, wide_hips, thick_thighs on the daily! And sometimes I'll throw in tags like 'stuck' or wardrobe_malfunction as I also love when a character is so thicc, it's an inconvenience sometimes!

bitchsuit is a personal favorite of mine.

to me is rimjob is the best

I love rimjob a lot too!

Some others that I like is prone bone, futanari, rape and maybe chastity, but I also enjoy some vanilla stuff

Gangbang, double penetration, infidelity, cuckqueen, sharp teeth, choking, cock worship, angry, short stack, slightly chubby

cuntboy and bottom growth/tdick, CRIMINALLY underrepresented here