Bottleneck checker is junk science, ignore it.
Either processor will be good.
The 9100f has better single thread performance which is good for sims, mmo and strategy games.
the 2600 has more threads which is good for multiplayer games with many participants.
You are more likely to run out of graphics capability in games than you would with either processor.
Particularly if you play fast action games.
You will have processor upgrades available either way you may chose to go.