Good twin for charter/instruction

[340drvr]

Operating a Seneca II right now in just that situation, and as far as I'm concerned, it's not particularly well suited for either task. Where are you located? We're in mountain country out west, and the lack of pressurization is a pain to dance around on most charter trips.
As others have said, tough to find an aircraft that fills both missions.

 

[TurboS7]

I think you are trying to find something that does not exist. Doing engine outs at high altitude does not get me excited at all. An accident waiting to happen. Sorry.

 

[SENECAII]

Seneca is a great plane for both.