Android phones, apps and tablets

Smartphone 101 question here:
Is there any benefit to me and the missus both having android phones (prolly Desires) in terms of sharing apps, data and connectivity etc between them, rather than me having a free iphone from work and her having an android?
(Sorry - frankly no idea what you can / can't do with these things...)

Latitude, that unlike the iShithouse, is actually useful.

Paid apps are linked to your google account. I've not tried using a paid-for app on two phones using the same account. I assume it's only linked to the account. Depends if you wanted to share a google account I guess. Apps are cheap anyway so I'd just buy two.

Obviously using the same phone means you can share chargers and SD cards and knowledge.