Hi guys!
Mr. Horst did not ask for advice wether to buy a single or a twin, but wether to buy a Seneca or an Aztec...
I would suggest to take no decision before having bought half an hour of flying time in each of them. And to sit in one of the passenger seats as well for some time, since I suppose that a six-seater twin will also be bought with the idea of carrying passengers in mind. And if the passengers don't like it, it will not fly much!
I have flown and instructed something between 100 and 200 hours on Senecas (models 2, 3 and 5) and I really don't like this plane. Poor visibility, zero passenger comfort (got complaints on every flight!) and the most unpleasant handling of all aeroplanes I've flown so far (Metroliner included...).
Especially the "3" has awful landing characteristics - I don't think you will find many of them without damage history to the landing gear! The Seneca 2 has the nicest handling, but it is considerably slower. The 5 is a very smart aeroplane with good performance, but very expensive to buy and operate. Far too expensive for a light twin, if you ask me.
Many years ago (like 15) I was also tempted to buy a share of an Aztec, but after close inspection, it turned out to be far too old then already. And another 15 years have passed since. But if you find one that was always hangared with reasonable hours, why not? At least, you won't lose too much money.
Greetings, Max