5.2” 115 lbs choosing between these two boards and have questions.

Ideally I’m looking at the 39” Tribe Valkyrie which is 50mm thick but it’s my first board and I’d like to spend a bit less money. My other choice is the Tribe Guard in either 38” and 53mm thick or 40” in 54mm. I’d be using this in SF Ocean Beach on smaller days. I’d like to be able to duck dive the board but also not have it be so small that it’s a chore as a beginner to get on waves. Any advice would be great.