Need collective wisdom

[azazzera]

I’m installing a water tank under v-birth. Want to know if one demention of tank is better over another. I’ve decided on one of two tanks that will fit in the space I have. My question, is one of these two tanks better with regards to stability. There are no baffling in the tanks so I’m thinking about water moving in the tanks. The squarer of the two is 22 gallons, 23x16.875x14.75. The flatter one is 20 gallons 33.25x17.125x8.75. Hope the pictures loaded. For a 73-72 Pearson 30. Any advice on instillation, tips ,tricks ,appreciated. Thank you.