Hi Mick,
Most insurance companies will replace the glass if you are not satisfied with the repair. So, the only thing you have to lose with the repair is the little bit of time that it takes to get it done. Most repair companies come to you, so it can be done at your convenience.
Personally, if the windshield is in otherwise good shape, I would opt for the repair first. But...that's just me.
Best,
WA