question,, which is better when looking at solar panels.??

Look at watts; that's how to compare their output. The higher voltage panel will require an MPPT charge controller which is usually more expensive. However, higher voltage panels can have advantages with using smaller wire and simpler wiring connections.
If you're just getting one panel I'd get the 12v panel and a simple PWM charge controller. If you're aiming for a large system go with the less expensive panel on a dollar / watt basis and use a nice MPPT charge controller.