I personally prefer Maia's BJJ record compared to Werdum, who fought at 221lbs +
Maia had to face prime Roger Gracie, prime Jacare, prime Xande Ribeiro, prime Marcelo Garcia (lighter but a damn phenom), prime Cyborg, young Lovato Jr, Romulo Barral and Braulio Estima. All these guys were physically in their primes, and fighting at their natural weight except for MG who can out-point you on pure technique.
Maia basically fought during one of the most TOUGHEST BJJ talent pools in grappling history.
Werdum's 2 World Titles and ADCC victory don't mean as much compared to Maia's quality, at least to me.