Which two extra capital ships Britain would retain at Washington

If Britain could retain two extra capital ships under the Washington treaty, would it choose King George V-class battleships or Lion-class battlecruisers?

Probably the two Lions, because they were more adaptable and would create a divisible six-ship battlecruiser force for global deployment.

The Lion-class ships are preferable to two older King George V-class battleships because the battlecruisers were easier to modernize and less likely to upset battle-line parity. With Tiger, Hood, Renown and Repulse, the retained Lions would create a six-ship battlecruiser force. That force could split into two groups of three while six-ship battle squadrons covered the Home and Mediterranean fleets. The 15-inch ships could form a Far East cornerstone from Ceylon, where common ammunition support and long-range presence would reassure imperial partners without basing the force directly at Singapore.