If you’re processing images with ODM, I would go with Sentera simply because they have funded some development in ODM, which means we have had more time to work directly with images coming from their sensors.
Looks like from a Megapixel standpoint that the P4 is only about 2MP where if I read the doc right the sentera is 12MP? Is 2MP good enough for what you are trying to do? I was surprised to see how low res the P4 was.
If you’re doing Agricultural survey, it’s more important (in my opinion) to have very accurate spectra so you can access the plant health/stress better. RTK is super helpful, yeah, but you’re not spot-treating each individual plant and you’re typically working with 30m+ booms, oftentimes not even with per-nozzle control.
I have a Sentera 6x on the way for use with an Inspire 2. Some of their stuff is able to be mounted to an drone with RTK, and their 6x has a GPS mounted to it as well (not for RTK positioning but to automatically snap the shutter at 80% overlap). They sent me a sample dataset here for the 6x: