best bearings? all of them

[fusionsx00]

well i finally re-re built my first stage
the hobby shop ordered a set of the cnc blocks just incase, then i saw the new bearing blocks have new bearings 5x11x4, thay are sealed soo all of the fisrt stage bearings,owb, motor mount bearing, tail drive bearings are new
but i still need to replace my mian gear bearings

i ordered boca bearing (SMR688-2RS)440c, and 52100 (MR688-ZRS)bearing materials
see which ones last longer, all of the ones i ordered are sealed and say they have permanat lubrication.
im weary of ceramics ,i have tried them on my 200, but there is way more load on this heli, the mfg states the load capabiltys are equal , just depends on the size ,
what can i say im chicken, and i like my heli too much to take a chance
but if anyone knows of any others let me know

now i dont think the bearings just wore out, my bearing under the owb, moved up
i didnt realize this untill my second owb went out and i saw the gear rubbing the frame

[nexgen]

those thin bearings do move around in the seat when they get heated, thats usually what causes more friction then bearing collapse. I use either CA or blue loctite (or a mix of both) to seat them. getting the outer race out when they disintegrate is a royal PITA tho.