you already stated both options, there is no option #3. snapdragon support isn’t there yet, you’ll have to make do with Intel and AMD options; for the stated use cases, even 5-year old models will serve you plenty. ideapads, thinkbooks, whatevers are consumer-class models and shouldn’t be gotten used (not even new, in my opinion) as they have nothing in common with T-series thinkpads.
if you’d like to hang on to your hardware for longer, go with the T14 (no S-suffix) as those things are easily expandable, serviceable and cross-generation compatible (same docks etc.).
you already stated both options, there is no option #3. snapdragon support isn’t there yet, you’ll have to make do with Intel and AMD options; for the stated use cases, even 5-year old models will serve you plenty. ideapads, thinkbooks, whatevers are consumer-class models and shouldn’t be gotten used (not even new, in my opinion) as they have nothing in common with T-series thinkpads.
if you’d like to hang on to your hardware for longer, go with the T14 (no S-suffix) as those things are easily expandable, serviceable and cross-generation compatible (same docks etc.).