fwiw Infinity Blade II and Asphalt 7 both run silky smooth on the iPad Mini. My wife bought one because it fits in her handbag and I've since discovered it makes an awesome gamining machine :)
Haven't used a Nexus 7 but it should be similar if not a bit faster. Can't go wrong with either I'd think
[Edit: on the subject of games, don't buy the latest Need For Speed game - it's a simplistic, samey, cynical cash grab from EA. But it's biggest sin is it's just plain not fun]
[Edit: on the subject of games, don't buy the latest Need For Speed game - it's a simplistic, samey, cynical cash grab from EA. But it's biggest sin is it's just plain not fun]