Being a rational person, and reading posts here, I am leaning to the BP & W instead of a traditional jacket type BC. It's like a linux compared to a macbook. A bit difficult but rewarding in many respects.
Is it too radical for someone who just started, and used a rental jacket for his first two dives with an instructor?
(I am not planning on any extreme diving, mostly recreational and in warmer climates.)
There are probably 101 posts floating around that will answer your question from various perspectives.
My personal feeling is that BP and wing, or BP and wing with long hose is not any more difficult to get used to than a 'standard bcd' and shorter donate hose.
It does however require a bit of trial and error until you get it just right.... but 'just right' is something that you are unlikely to find with a bcd, unless your dive centre is king enough to let you try out all their bcds, for several dives... (what fits on dry land will fit very differently under water or floating at the surface).
The webbing of a BP and wing is fitted to you. When you change shape, either adust or change the webbing for a few dollars.
A BP and wing with a longer donate hose would have solved the problems that i repeatedly, repeatedly asked my early diving instructors about. I wish I had dived the configuration sooner. I also wish I had used different instructors.
When I travel to warmer climates for diving I take ALL my equipment in a hiking rucksack. I separate the hoses from the first stage, and the back plate from the wing. Roll the back plate up, and ensure it is packed so that it won't get damaged. Regs go in hand luggage. Nice and easy to travel with. Remember to take a small tool kit.
The BW wing set up is not 'radical' it is very very simple and it will always fit.
My dive club hate them....