To me there's 2 questions/points here, one is the other is how to use it and second is the suitable generator.
A change over switch - not phase failure, only a manual, is the easiest system to put in. ie it disconnects your house (load) from the normal mains supply and introduces a different supply means (generator) is cheap & easy to put in and safe for the guys up the poles/cables. This is a must.
The second is a bit like a ford/Toyota/holder debate - everyone has a favourite. and no there's right answer.
Caveat is cheap to buy is maybe not cheap in the long run.
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