No right answer
There is no right style.
I wrestled with this one for a long time. I also included a third style, those that shift gears. Alex P, John Schmidt, Raj Hundul, they can shoot pretty quick at times. But they can also slow down and grind when they need to. They have some of the advantageous of both styles, but have the risk of sometimes being in the wrong gear.
Proponents of the quick pace site momentum, keeping the game easy, not over thinking. Proponents of the grinder style is the reduction of what appears to be unforced errors.
Neither style is better. That is clear in that you have champions on both sides. Mike Siegel, Buddy Hall, Jim Rempe, Nick Varner, and today Ralph Soquet, Neils Feijen, Thorsten Hohmann, and Dennis Orcullo all fit this style. On the faster side you have Earl, Hatch, Shaw, Morris, and quite a few others that play pretty quick.
In the end the results come down to what you do with your style.
There are a lot of haters about deliberate or slow play. They have an idea about how the game should be played and can't stand others that don't toe their line. Ignore them. This is a solo journey. In my experience people only get frustrated by slow players because they aren't getting enough shots to have fun free wheeling and they don't want to work for their opportunities. People wonder why players take time between shots. After seeing some of the reckless misses from the freewheelers I wonder sometimes why they DON'T. But it's all good either way. Play your game and take it to the top level.