Then Raspberry Pi 0 is better option, it's only $5 & still good enough to run full node.
FYI, Raspberry Pi focused on cheap barebone PC & open-source hardware rather than performance
Most of the time i ran into memory problems when side loading stuff next to running commands on the pi node. The biggest pros for me is the memory gain with the 4gb version.
Yeah they just released the pi 4 on monday so the cost of the newer version is higher if you go with the 4gb and need it to run other apps in the background while hosting the node.