Go for the greater range of gears, no doubt.
On the steepest bergs you‘ll get people stepping off in front of you. You need to slow down and reacclerate if you want to go past them.
It‘s one thing climbing the Koppenberg in your 42/29 doing your prefered watts and cadence. It‘s another thing entirely trying to rev back up from 30rpm at 600W after having lost all your momentum trying to go around other people…
Koppenberg is especially terrible for this as it starts asphalted and steep, so it lulls most people into going hard at the start already. Then you turn left, see the cobbles and the insane ramp up, and most people realise they are screwed 
That coming from someone who did this at 4.2Wkg FTP @ 80kg a few years back.
I‘m 2552
