CoG/iCoG or 9th Anniversary Prime?

You need to compare your total w.att before any %att potential or buffs, but after any straight attack buffs you normally use, to your base mainstat + additional mainstat on gear or in buffs, but before %mainstat. Neither of these numbers is shown in the stats window, unfortunately, so there's some adding up to do.

For me with my current stats, 1 attack is only worth about 2 STR. So I'm going with the 10 allstats. But YMMV.