I think the upgrades are a great idea. I used to work in field service for various mobile home manufacturers and they loved those press-fit in-line outlets too.
As far as what to use for replacements, I personally prefer a good quality receptacle over the cheaper ones. The price difference is about $1 and for that I might as well go with the better one. Also, the push-in connections on the back are worse than the in-line outlets as far as wire contact surface. I would strongly recommend using the screw terminals on the side for your wire connections. This is my personal preference and I am not imposing my will on anyone, just sharing.
He is a good article on the subject:
https://www.thespruce.com/not-using-...itches-1152406