North is overhyped in case you like crowded places or you are the one who loves to party. South Goa is apt for serene nature and just lazy relaxation time. Cost wise it might be on higher side but if you get a good deal please go for South Goa.
Please do both, start with North and end with south, stay at palolem it is a beautiful place and close to all other places like butterfly beach, cola etc.
North Goa for sure. It is more happening and vibrant for a solo trip. Also, you are more likely to meet other solo tourists there. Make sure that you visit Chorao Island when you visit Goa - https://bulbulonthewing.com/chorao-island-nature-trail-goa/
You can do both. Just rent a bike in north and explore then come south. There's a lot to do in North than just the night life. This is a good time to explore. DM if you need more details, I'm a Goan.
It depends on what you are looking for.. North Goa is slightly more commercialised while South is the quieter, more quaint side of Goa. So, you can take your pick, accordingly!
You should stay in North Goa , rent a bike and than you can explore both North and South Goa. there are many options available in North Goa for accommodation than south Goa 👍