I think the real problem is, if you have BOTH.
I was 'happy' with five friction slide boxes. Used them for years, didn't spend much time thinking about it.
Then I got one ball bearing box. The other boxes got stiffer, more reluctant, cheaper feeling by the day...
Six months later I had 1 friction box, which I hated to use.
Silly, but the way it was.
Now I won't even consider a cheap ball bearing slide unless it's smooth.
In a practical sense, if you have mixed ball and friction, you will always be yanking too hard on the BB drawers, and slamming them.
Or pulling, and cursing the friction drawers.
As to actual reliability? I have SnapOn, Mac, Matco, Blue Point, Craftsman and generic BB boxes. Virtually ALL of them have had multiple slide replacements.
I've only had to replace ONE friction slide in my life, and brother, had it been abused.
You can trash a BB slide in about one second. I'm working on a KRL slide tonight, guy slammed the overloaded drawer shut, once, really hard. Stop bent, cage exploded, bearings everywhere.
Do the same thing with friction, (you really can't) and big deal.
Friction slides lightly oiled, kept reasonably clean, are a lifetime of reliable yanking too hard or pushing hard
