That’s a broad list.
I’d lean toward Greg too, depending on your play style.
A sizable buff to Critical Chance will meaningfully increase tile damage.
For Titans, that’s huge. The payoff is actually potentially larger than an attack buff — though it’s certainly even better when you stack both.
For Offense and Events, it’s more dependent on your play style.
If you tend to prefer to charge up Special Skills and snipe enemies to death, then you may not take enough advantage of the boosted tile damage to see a big effect from it.
But if you tend to use tiles to kill off enemies — particularly in conjunction with Special Skills that facilitate using tile damage, like mana controllers — then the boosted Critical Chance will similarly benefit you tremendously on Offense.
And for Events in particular, it depends if you mean doing better completing them, or becoming competitive.
A strong tile damage approach is a good way to effectively complete Events with reasonable scores. But it won’t get you the absolute top scores, because for those you really need to do a lot of the damage with items instead of tiles, to maximize the Match Score.