We are tossing up between another alarm keypad or get a remote fob (same price) - which one is better? Does the fob stop working after a while? Also worry about losing it.

I'd be using a fob, I've got them for my front gate and front door. Can't wait to start using them.

I never use the keypad, only the fob. Ever so convenient It has a replaceable small battery inside it.

I'm more worried about leaving the fob inside the house and therefore locking myself out

fob...don't see the need for a secondary keypad. Fob opens the garage door and deactivates/activates the alarm.

it depends on the features of the remote, if to want a duress, ambulance, or fire alarm function then the keypad would be best, if it is just arm/disarm, panic then a wireless remote would be best

Scenario:

Husband and Wife, two seperate cars and thus two seperate sets of keys.

When going out together, one person leaves keys (and keyfob) behind, as they are not driving. This allows intruder to deactivate alarm with keyfob (admittedly once it has initially triggered).

For this reason, I would be avoiding keyfobs

If I am leaving car keys at home I never leave them out in plain sight. I hide them somewhere well hidden.
I would be the same with a fob if I had one

Can it do rolling alarm garage doors? If so, how?

Dunno...our door has a rolling code alarm...there's an extra button on the fob which operates the door.

I think it's like most fobs once they are "sync" i.e. do the reset bizzo on the roller door motor the fob and door mechanism know which code to go to.

Most alarm systems are set up to open garage doors by connecting directly to the contacts on the motor itself. The button on the alarm fob triggers a relay on the alarm that acts like the internal switch you can have in the garage. The wireless system of the garage door opener isn't used at all.

Paul