Originally Posted by
Igneous Faction
Having a butted tubeset is always a pro. They'll end up being stronger and generally lighter.
Not always. It only makes it stronger if you are talking about the type of stress put on the bike while it's actually being ridden. If you have a frame that you expect to get hit in the middle of the tubes the butting will make dents and eventual failure more likely. Therefore for a thinner tubed mtb frame or maybe one that's locked up butting may not be a pro.
Originally Posted by
Igneous Faction
1. Lugged vs. Tigged
2. Threaded vs. Threadless
Those are basically aesthetic questions. Personally, I'd take the De Bernardi because I hate change and love nothing more than a lugged frameset with a threaded fork.
Threaded threadless is not an aesthetics question. Threadless offers many advantages while threaded offers only aesthetics and a different adjustment method.
While in theory lugged vs tigged is mainly aesthetic in practice, as exemplified by these two bikes, lugs limit you to outdated thin tube shapes that are heavier or flexier then modert manipulated and OS ones.