If You Are Doing This For Yourself, Girth Should Be Priority Over length
This may seem counterintuitive since most guys want length for ego reasons even though they know that most women claim to care most about girth
But in reality a longer penis isn’t necessarily going to make sex that more pleasurable for the man. At least, not like a more girthy penis will.
The more girthy your penis, the more the vagina grips to you, the more internal walls you feel during sex, etc.
If you are only doing PE for your own sexual enjoyment, it would make sense to focus on girth.