A cheap ticket does not guarantee a cheap day once travel, parking, food and booking terms are included.
The useful answer
Compare plans with one checklist: admission, return travel or fuel, parking, road charges, food and likely extras. Then consider arrival time, walking distance and cancellation terms before deciding which option is genuinely best value.
Train or car
For rail, compare the whole group’s fare, Railcard restrictions and the connection from the station. For driving, add parking and any city charges. In both cases, check the final leg.
Easy savings
Bring water and snacks, download the map, and note the free-cancellation deadline. Do not treat an annual pass as an automatic saving if you may not return.