Personally, I haven’t seen much of a difference in ceramic hybrids vs stainless steel upgrades other than the sounds on the cast. The ceramics are a little higher pitched. I do believe one benefits greatly from a spool bearing upgrade if they do a lot of casting, but the stainless seem to do the trick for fine at half the cost. You’ll be looking at 30-50′ longer casts on average with less effort, and less effort means more accuracy.
There’s one exception in my experience. The new Shimano Curado K spool bearings are much higher quality than previous versions and do not require an upgrade, just a good cleaning right out of the box, then they perform just like the $15-30 upgrades.
I have about 15 sets of these bearings from HP Reel Bearings. I also have a set of Boca Orange Seals from Tackle Warehouse that I often forget which reel they’re in because they work the same as the $15 stainless HPs.
https://www.hpreelbearings.com/default.asp
https://www.hpreelbearings.com/searchresults.asp?cat=1814
https://www.hpreelbearings.com/searchresults.asp?cat=1817
The biggest issue with bearings is a good thorough cleaning with acetone once or more a season. I use a glass bottle and shake/swirl the heck out of the bearings and continue replacing the acetone until the fluid is clear with no suspended bits of oil/grease. Some people use an ultrasonic cleaner or leave the business end of a electric toothbrush in the acetone overnight to agitate the fluid and shake the gunk out. You should also be doing this on brand new reel bearings because they’ll often pack grease into a places that requires light oil. It’s surprising how much better a reel feels in general after some of the factory grease is removed.
Then use just about the lightest oil you can find, and use only one large drop or two little ones. Shimano oil works well, but my preference is TSI 321 with a needle oiler from eBay. It’ll last a lifetime.