system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: (NSFW) Using one's hands is better for bringing one's partner to orgasm than using one's penis.

I'm basing my argument on the premises that partners prefer sexual stimulation which is varied. Manual stimulation allows up to 10 different apparatus to be used, in any combination, while stimulation using one's penis only allows one. Moreover, one can expand the girth of one's hand at will, one can't do that with a penis. Girth is a factor in leading to orgasm. One can be much more forceful or delicate using one's hand for sex, and one has a wider range of motion with wrist and finger movement aa well. One might argue that using one's penis has the advantage of warmth,  but one can simply rub one's hands together before beginning in order to compensate. Fingernails can be clipped. Lastly, one's arm length allows one more range of motion and therefore more variation in positions.
gpt
You use what best works for the partner. That could be a penis, your hands, your tongue, their hands, a vibrator or other toy, etc. There is no blanket "best" that applies to everyone, or even most people like you claim.