I saw the earlier comment about having concerns about safety of propane. Safe it is, respect it you must. Maintaining propane equipment, having a CO detector, checking for leaks
with a little soapy water at the joints annually.
I would say built in stove is probably a bit safer than portable. The connections are permanent, it can't be accidently knocked off the counter while burning. The fuel "bottle" is outside away from the flame. That is not to say a portable propane/butane stove is unsafe but I would say built in stove provides an added margin of safety.
I can't speak to all models of portable stoves but the ones I have seen take up more counter space (especially including the bottle of fuel) than a built in one.
Some people do all electric and find that suits them but unless that electric option is well done (quality workmanship and safe wiring) and provides the full functionality and features of the propane it replaces I would expect resale value to go down. Plug for a hot plate vs. built in electric cooktop vs. built in propane cooktop will impact the value or suitability for perspective buyers. As will the quality of the implementation.