Xavi and Iniesta both have vastly more titles. I don't think longevity trumps that. Also Iniesta was insanely gifted on the ball (only Zidane was comparable, really).
Shame on me for taking the bait though.
Modric has 5 CLs, 1 WC final (w/Croatia), and 1 WC SF (so far)
Xavi-Iniesta had each other and have 4 CLs, 1 WC, 2 Euro Cups.
Zidane has 1 WC, 1 WC final, 1 Euro Cup, 1 CL
Rijkaard has 1 Euro Cup and 3 CLs
Matthaus has 1 WC, 1 Euro Cup, 1 WC final
Xavi/Iniesta kill the others on league titles but they also had a GOAT in Messi for those lol. I don't think you can keep Modric off this table anymore. Among these, it comes down to preferences really