Cavalier/Hammer or Berseker/GS/Axe
Well cavalier isnt limited to hammer, and berserker isnt exclusive to axe/GS. Common runes for cavalier are lyssa, and common runes for zerker are melandru. Each set of runes makes up for what the gear itself lacks. So youre really just choosing runes. Cavalier/lyssa or zerker/melandru? Lyssa axe/GS is great with cav/lyssa, and hammer is great with zerk/melandru. Its just different playstyles
If you’re going to make ascended, go with berserker – especially since you mentioned both PvE and FotM.
Also, hammer is only good in WvW. It’s essentially never the ideal weapon to use outside of WvW and sPvP. Very low damage and there are far more effective methods of dealing with trash than using a hammer (LOSing them and 100b > whirlwinding into a wall/object).