Hi,
I’m building a 3D printer with Arduino Mega + RAMPS 1.4 and I’d like to add a touchscreen display to control it (menus, axis movement, temperatures, print from SD, etc.).

I’ve seen options like the MKS TFT and BigTreeTech TFT screens, but I’m not sure which models work properly with RAMPS 1.4 or how exactly they should be connected (only through EXP1/EXP2 or also through the serial port).

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most touch screens are serial devices. Ie they they are in really small computers with screens connected via serial to your controller.

EXP1/EXP2 is normally used for 128x64 pixel or 20x4 character lcd displays which many touch screens will emulate. Why you may ask? Because touch screens focus on looking pretty and ease of use but are limited in functionality. the stock 128x64 lcd has all possible functions.

The one to stay away from with a ramps is the mks ts35. This screen is drawn by the controller pixel by pixel and the ramps (being a obsolete 14 year old 8 bit board) is just not powerful enough to run it