Both Peters and Smith cost their teams first round picks, with Smith's being substantially more valuable trumping the late round picks Philly added to the Peters deal. Peters was a guaranteed pro bowler in the beginning of his prime for barely more than a 1st. That beats gambling with first round picks, even though Dallas hit a home run with Smith. Would you draft a receiver in the first round, or trade that pick for Deandre Hopkins? Would you spend one on a linebacker, or trade for Anthony Barr? Peters has made 9 pro bowls, and judging by thursday he'll be in his 10th this year. Oh yeah, Peters makes 10M$ annually, Smith 12. Again, not arguing who's better, just the value vs what was spent.
Kelce, Brooks, and Wiz combined cost 1 6th round pick in draft capital. Those 3 cost us approximately 17M$ a year on their longterm deals. Conversely, Martin, Frederick, and Connor Williams cost the Cowboys two 1st round picks, one 2nd round pick, and about 25m$ annually.
Lane is a first team all-pro first round pick that makes 11 M$ annually. He is the 12th highest paid tackle in football, beating out everyone in front of him for an all-pro spot. La'el Collins is not a pro bowl caliber player, and he makes 7.5 m$ a year through his extension.
Philly's line cost two 1's, a 4, and 2 6's. They make about 38m$ a year.
Dallas's line cost 3 1's and a 2. They make about 43.5m$ annually.
I'm not arguing who has a better line, where clearly Dallas has youth on their side.