I alway prefere Beneteaus or Jeanneaus over Bavarias - if we are talking about the boats of the same size. But they are not.
For Saronic I would opt for Jeanneau
(between them - depends on Your preference: Jeanneaus are generally a little better sailers, Beneteaus a little more roomy boats). The distances there are short and harbours small. You would rather need a handy boat in crowded places, than a passagemaker.
I would rather go for Bavaria - distances are greater, and longer waterlina pay there. 47 is not bad sailer, but You need to remeber that they are more cheaply built than French boats, so You may experience some more small inconveniences (like the locker's doors opening themselves on wave and so on). But really - it depend on the owner, how well the boat is maintained. Generally - You are getting what You are paying for, and with most of the charter
companies You are not paying for much - in most cases not for good upkeep. When I was chartering in Greece
(for about ten years, by average six - seven weeks a year) before buying
own boat, I came to conclusion that the best way is to charter the most expensive boats I can afford (after bargaining like old Turk on the market)
I do not know when You want to come - if You will decide for Cyclades in Meltemi season, may be You will look browse again to look for Ocean Star.
They are the sturdiest boats there for charter - it was the reason, why I bought one, but of course, now You can rightly tell that I'm biased a little