It is very much like saying Canon or Nikon.
One is not necessarily better than another, but in the same way I wouldn't swap my Canons for a Nikon. Your lighting system is a long term relationship, so get it right first time and stick with your decision.
Personally, Elinchrom all the way for me. They
are Swiss made (all of them, not China or India as mentioned above (their Prolinca range were made in India, but are long gone)), they are probably the most widely used professional system (certainly internationally), they have several very neat tricks up their sleeves (like the very portable Quadra or very powerful Ranger), remote power control via Skyports, internal octaboxes, extremely well made (I've been hammering mine for more years than I care to mention and the above commments on the loose mounts is not my experience at all), have an excellent budget range (D-Lite) to get you addicted early, plenty of third party accessories now available, excellent
second hand retention values (check out Ebay), the equal power level indicator across the whole range, a system you can never outgrow and you will never look back and regret the purchase, or wish for another system (well, maybe a Profoto at a push).
Oh, and I forgot and probably most importantly for me, they are completely and utterly consistent from shot to shot to shot, both in colour and intensity. Something that cannot be said about all brands.