Whats everyones preference on u joints?

Gonna send the neapcos back to summit for a refund.
Once Summit inspects the part and deems it was installed, even with zero miles, they call it used and will not issue a refund. BTDT
BTW - Do U joints w/o a grease fitting eventually need to be greased?
There not supposed to.
If so, how? (remove and pack like front wheel bearings?)
On new sealed solid U joint I get, I take them apart just to double check each cap has grease inside of it. The bearings are roller so they do not get packed like a wheel bearing. What I do is just add a cap full of grease to what is already there in each cap, slide the cap back on and go. The centrifugal force will provide all the gravity and pressure needed to force the grease I put in the cap as the old grease wears out & thins.

The sealed U joint is now double greased and should out last year my kids life span. I haven’t changed a U joint out when I do this in 20 years.
Or, are newer U-Joints w/o grease fittings "sealed" and dont' require maintenance?
That is correct. That’s the idea. As delivered, it should be a life time U joint under normal use.