i had this dilemma last year myself, in the end i went with an X1 Carbon 6th gen and an eGPU (aorus gaming box 1070) and i havent regretted it but my reason for the eGPU was purely for gaming.
there are some slight caveats, first is the fact that thunderbolt isnt perfect, you will sometimes find yourself having to shutdown the system and power off the GPU before itll connect and thunderbolt cables are painfully expensive which means its extra stinging when you find youve managed to somehow damage it like i have with mine recently but overall it makes for a great little portable rig
there are some slight caveats, first is the fact that thunderbolt isnt perfect, you will sometimes find yourself having to shutdown the system and power off the GPU before itll connect and thunderbolt cables are painfully expensive which means its extra stinging when you find youve managed to somehow damage it like i have with mine recently but overall it makes for a great little portable rig