Remember what I said about "beauty is in the eye of the beholder". Both guns attracted your eye and wallet.
If you want to build a couple of kits, avoid the Spanish guns, and buy Italian guns. Specifically, those made by InvestArms in Italy.
In particular, since you want to build, "Invest" (excuse the pun) in a Lyman Great Plains Flint Rifle Kit, .50 caliber (or .54), Lyman catalog#6031114 & the Lyman Percussion (Not available in flint) Plains Pistol Kit, .50 caliber, Lyman catalog #6010610.
If you buy these kits (or finished), you will be "miles ahead" of the Traditions guns picked out. I have sold dozens and dozens of Lyman Great Plains rifles in flint and percussion in both calibers over the decades. I will not hesitate to buy mint condition used Lyman flint or percussion rifles if the price is right.
A Lyman GP rifle will shoot "cloverleaf" groups at 50-75 yards if you do your part.
IMHO, THE BEST INEXPENSIVE flintlock rifle, finished or kit, is the Lyman Great Plains Rifle in .50 or .54.
You should buy what appeals to you instead of me. Experiences teaches us lessons in life. Sometimes, the only way we learn is by buying according to our eyes and brain, and then educating ourselves by seeing more examples of better quality firearms, that in turn, captures our eye (& wallet). Time permits us to continue to "mature" to the point where we find ourselves finally satisfied with what we've got.
Folks don't just stand in awe looking at a longrifle or double barrel flint smoothbore, made by Jack Haugh, Judson Brennan, Mike Ehinger, or the late John Bivins. They have to go through the "maturing process" that starts with the Traditions or CVA or T/C firearms.
Along the way, they begin to get excited at Lyman or Pedersoli, or Uberti. Over time, they are captivated by work by the Caywood Brothers, Matt & Lori at TVM, & the Cabin Creek Shop.
Then, they reach the point where the works of the master gunmakers of the 20th & 21st century, some of whom I mentioned earlier, are within reach of the wallet.
Its hard to see quality on the screen, its easier to see it "in the flesh", but the eye & brain must be "educated" to tell the difference.
ZZZZZZZZZZZ. Everybody still awake????