looking help on a light decision

looking to light a 4x8 i ether get 2 480 w quantums for 360 dollars
or i get one 720w light bar for 398 and use 315 on the other half
is there any reason i should spend the extra ang get th 720. like is it really gona yield me more
or is the two 480w gona be just fine

Bar style any day and everyday.

Start with bar light use half the tent for a cycle
Then weigh power cost to yield …
Then decide on other half
My advice