go for 110 you never know when you might need it on site and having the 240 doesnt give you the choice.
Ive got both i bought them off a mate a few years ago and i never use the cordless the batteries dont last 2 mins especially with 50s or above. Used to have the senco ones but they constantly jammed.
If it's that cheap, at least you won't be too angry with yourself when it constantly jams.