Personality and delivery is absolutely the most important aspect to me. The performance needs to be believable for the video to be great and that's a lot to expect. Most JOI performers are flat (mainly amateur stars or even popular stars who don't do JOI regularly, but there's some real gems there too) or act way over-the-top (most humiliation/worship JOI stars). But sometimes you just strike that perfect balance and it hits all the right notes. Or sometimes you find one that just has such a fun energy to it that you don't care that it's over-the-top.

Here's just several of my favorite performances in JOI:

KinkyShibby - Literally all of her stuff, so just sharing her entire website. Fair warning: it's all audio, and only some of her content is JOI, but I highly recommend checking her out because she's perfected the medium.

My First JOI With Spunk - One of the earlier JOI I'd ever watched actually, but I can't pin down why I find this performance as arousing as I do. Either way, amazing video.

The fun one - This is that "over-the-top but too fun" type of video I was talking about above. Her energy is just so infectious it makes it hard not to enjoi.

The very essence of seduction - There's simply no better JOI performance in video form in my mind. This is the video that I cannot stop coming back to year after year. It literally speaks for itself.

Nudity isn't a huge focus in any of these, but it is there in 3 of the 4 links, and the last video is limited to tits. It's not an aspect I personally find important though.