I had the same quandary. I don't know anything about grease and I'm sure there's lot's of good ones. I changed my bearings this spring.
The old bearings were 5 years old with lots of KM's, still in very good condition. I have EZ lube spindles so only maintenance has been a shot of fresh grease in the fall.
I asked the guy's at Kingston Bearings and they suggested lithium based grease for boat trailer bearings.
My bearings came packed with red grease and the trailer manufacturer specifies Lithium Plex Red Grease #2.
I used Lucas Red "N" Tacky.
https://www.youtube.com/watch?v=mMmSQSjraSEhttps://lucasoil.com/pdf/TDS_Red-Tacky-Grease.pdfThe Amsoil grease appears to also be very good.
https://amsoilcontent.com/ams/lit/datab ... /g1279.pdfPeavey Mart carries Mystik general purpose grease, if that's what your looking for.