Both cim and rimming come in different varieties.
My first rimming experience was one I will always remember, but I gave up on it as subsequent experiences were a let down. Often the girl needs to get you in a less than comfortable/erotic position (legs splayed wide, on all fours, or such like). Also, rimming means different things to different people. To me, it means lightly and sensually flicking the tongue around the outside, whereas some seem to want to ram their tongue as far inside as they can get it And the thought of kissing someone after they have had their tongue up your innards is a bit of a turnoff, for me at least.
There is something very sensuous about cumming in a girls mouth and her then sensually swallowing it. Less so if she immediately makes a mad dash for the bin or bathroom to spit it out. Some seem to make quite a disgusting performance of it, retching away to get every last taste of it out, which rather spoils the moment.
If you haven't tried either, I would recommend ticking both off the bucket list. Just do some research beforehand to find someone who offers exactly what it is you want.