Do you mean you are considering buying a high capacity 45, or the possibility of facing a high cap 45 when you have 8 shots of .357?
If the possibility of being attacked by 5 people was greater than average, I would opt to have more than 8 rounds available. Glock 19/23/32
I typically carry a subcompact Glock that's 9 + 1
Yesterday, I carried my Glock 38 (45 GAP) 8 + 1
Criminals and psychos are mobile and my show up in "good" areas unexpectedly, carry accordingly.
Carry the gun you would you would prefer to defend your life with, in the off chance you have to.