Breaker size is determined by wire size, and wire size is determined by load and run distance. The 70A panel will be fine and you can then outfit it as you wish. With 2 20A circuits in the garage, #6 wire from main to sub and a 50A breaker will be fine. If you wish to have a full 70A capacity in your garage run #4 wire and a 70A breaker. This should help:
https://www.askmediy.com/subpanel-installation/
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2009 Cayman PDK With a few tweaks
2021 Cayman GTS 4.0L
2021 Macan (dog hauler)
Last edited by Cajundaddy; 04-04-2020 at 12:05 PM..
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