I spent ages trying to decide between the 5 Pro and the 6 Solar. In the end i couldn’t justify the extra cost and went with the 5 and can confirm that it is an amazing smart sports watch.
Once you get past looking at the various specs and start using it, you don’t notice the differences. the 5 works really well and has even contributed to my decision to start running.
If you want to use the Garmin Pay, i set up a Revolut MasterCard account which works, Visa didn’t. However it is not the easiest to activate, I had hoped you just hold the watch near the payment reader but you need to go to the menu and select the card first.
Based on the saving I would go for the 5 Pro again every time.