I can only really think of Three considerations really;

1: Pent shed has more height on one side so you can store tall items against the wall.

2: Pent often lends itself to being sited against a taller building or in a corner.

3: Apex has more height but in the center so not as easy to store tall items.

Or if you're not too fussed either way just choose which one you prefer the look of…

hope this helps.