Wow. You're kinda making it tough either way.
First of all, you'll need someone to drive you home from the hospital, help you out of the car & into the house.
I can only speak of the surgery because I haven't had the radiation.

Where exactly are you? There must be some kind of state-funded home help/district nurse who can come over & check your catheter etc.
Make enquiries now about what's available.

If you have surgery, the catheter is normally in place for 2 weeks. So you'll probably need some sort of assistance throughout that period.

The good news is you've come to the right place.
Keep coming here for questions to guys who have been through this/going through it.
You'll find lots of helpful information here.

The decision is yours - because it's your body - but if you're willing to share test results from MRI/biopsy (Gleeson score etc) you'd get more accurate answers.