I like to play percentages. In this case, that means going with the younger guy, McShay. There's simply too much to keep track of in that profession, and I like the younger guy's chances of being more single focused, less inclined to make mistakes, and still opportunity to improve. McShay has upped his game dramatically in the past year, noticeably more confident when paired with Kiper.
Admittedly, I'm drawing from my own experience. I'm nearing 50 and making more and more mistakes in personnel evaluation, so obvious the last few years that I've cut back studying all star games, etc. I've had fewer opinions and a higher percentage of them have been wrong, not a thrilling combo.
Luckily there are tradeoffs, like more reliable wagering systems. :D
Kiper is hardly over the hill but I sense less energy and creative evaluation. It's hardly dissimilar to 20+ years ago when he replaced the older crowd as the king pin. I remember buying a slew of draft guides in the mid to late '70s. This is hardly as recent a specialty as fans want to make it. In my sophomore year of college at USC, spring 1980, I did a paper for a Sports Information (SPIN) class, evaluating the draft gurus. There were at least a half dozen of them.
Kiper's lucky break was he was so much more "normal" in voice and appearance than Joel Buchsbaum of Pro Football Weekly. Buchsbaum came around many years before Kiper and was markedly superior. But he didn't play well on TV, was somewhat reluctant to appear, and was consequently used very sparingly on ESPN, opening the door for Kiper.