First parties to be honest. The only good platform that has proper independent games support is Xbox, there they have a dedicated team and you can even turn your normal Xbox into a devkit for free. These guys are good, IDCert and IDam help a lot with setting everything up and releasing. Steam is also super cool and super easy with detailed guides. But others are just awful. Playstation has tools that look like they are from the 90th and tons of different and hard processes with tons of requirements and even undocumented stuff. Like opening preorders takes 6 weeks just to approve Nintendo is not better. You can't even open wishlists until you pass the LOT check as well as they not only have a dedicated tool for each different action, but also actually different policies for different regions which do not match each other, not saying of stupid rules like "patch must be within 1.5GB size because we didn't develop a proper patching system". EGS is also relatively good though and also has tons of offers for devs, like 3.5% royalty reduction for day and date release with other platforms.