I am with Brent. All the stuff I send out the door I try to do roller, but my own is flat tappet, not because it's better, but because I don't pay me
That being said, Crower Camsavers, a good cam with enough taper and good install and break in, really not an issue. In fact, I'll say what I have said before, I haven't personally seen a cam fail that didn't have a preventable reason. No attack at anyone, and certainly not thinking about any single engine in particular other than those who showed up on my doorstep, but I am not sure there is a name-brand cam or lifter problem
The other benefits with a flat tappet for that application are: 1- likely don't need to machine for spring cups. Rollers I like to do it because I haven't found a spring I like that will locate on the Ford head, and 2 - A little easier to manage overlap (not that you can't get there, but typically a flat tappet will have a little steeper ramps than a hyd roller)
I do love me some hyd rollers, LOL, but there is an associated cost