Since Spanish guns are often the most affordable, they are a great value if a person wants to increase the quantity and variety of guns and calibers in their collection without spending a ton of money.
While the Italian guns often have nicer wood, workmanship and performance, there seem to be lemons spread among every manufacturer and model. The more expensive guns usually have less defects, but they do occur and can sour a purchase.
TC's have the best new and used life time warranty, but they don't seem to produce as wide of a variety of popular traditional models. There are quite a few on the used market which can be favorably compared against the price of a new Spanish gun.
I've been largely satisfied with Traditions caplocks as opposed to CVA's, and I think that most American inlines shoot better than most imports.
Dollar for dollar, the American guns are probably the best shooting value overall, but the Italians seem to have a lot more models and stylish features, which the Spanish like to try to replicate at a more affordable price, but often sacrificing quality in the process. Surprisingly though, some Spanish models do offer relatively excellent shooting performance and accuracy.