Which grinder?

[NDT]

This may sound like a stupid question... is there any reason why I should replace my broken 5" angle grinder with a 4.5" rather than another 5"? I don't have many discs etc knocking around so could buy either.

I'm planning to do some work on the Mini on Saturday so I need to get one ordered today.

[guru_1071]

i would day that 4.5" discs are far more common (and therefore cheaper) if that helps

[NDT]

Thanks Gurus, that does help - just had a quick look online and 4.5" grinders are far more common.
Must be (slightly) easier to use in tight corners too.