It depends on power usage, with an offset you will always use all the power till the PL that you have set for the card (if you set PL of 250W, then the card will use 250W)
With an absolute clock, even if your PL is higher, the card will only use enough power to keep itself at the parameters you set ( I set the PL to 250W but my card only runs at 243W)
See what works best for you, and the best parameter to check is the energy efficiency achieved with your clocks, I run my 3080 somewhere around 410kH/W