S62,
There are so many different factors in your question

But above all, let me state you one very important rule:
Its all in the preparation.
What I mean with this is that whatever the wax and sealant that you end up choosing, nothing beats a good well prepared and polished paint.
There are various nuances between products in terms of looks, so have a deep glow, some are more glassy in their reflections, some work better in dark colours, some work better in silver or light colours. What matters in the end, IMHO, is that you have a well taken care of basis and that you use the Wax/Sealant of your choice to
protect the finish and give it a little touch to your liking.
If you are interested in protection, I am very happy with Wolf Chemicals Nano Sealant, that thing rocks in beading and sheeting. You can see my review here:
http://www.m5board.com/vbulletin/search.php?searchid=5373260
But I also enjoy to use Zymol Concours on my car, it leaves a very nice blingy finish on the car, as if a silvery/glassy layer wrapped all around it. Beading is superb, as with any Zymol wax, but the durability is just not there compared to the Nano Sealant (and durability matters for me during winter, where in the freezing temperatures, I need something against the salt, grime and non-washing while the tap outside is frozen).
Have fun trying some products, that is part of the fun of Detailing
