Difference between heads hyd flat vs roller

Hydraulic roller lifters are heavy compared to a FTH. It takes more spring to control that heavy lifter at rpm. I can't say for sure but I have heard that retro rollers for LAs are the heaviest.
I have heard quite a few guys here on FABO complaining about roller lifters. And
have heard a few guys extolling solid rollers.
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I've been running the same hydraulic FTH lifters since about 2004 when I installed a Hughes HE 3038AL cam with specs of 276/286/[email protected], 230/[email protected], and lifts of .549/.571 (1.6 arms) using Hughes 1129(IIRC) dual springs. I've been shifting it at up to 7000/7200. I got no complaints.
jus saying.