Titleist 917F2 Advice Needed - 13.5 or 15 Degree?

Hi all

Normally have 15 degree and 18 degree Fairway wood in my bag

Also hit the 15 degree as my Driver 9/10

Am going to buy a pair of 917F2's tomorrow and wondered if going 13.5 and 18 was better than 15 and 18

The 13.5 can be adjusted up to 15 or down to 12.75 but the 15 can only be adjusted down to 14.25

Thought it might give me better options?

Agree?

Ian