Aikman was the poster child for accuracy and consistency and was probably the top 1 or 2 QB's to throw in a timing-based offense, a real challenge for a QB like Prescott.
The other thing that Aikman did better than most I'd seen was adjust for the differing speeds of his receivers on slants and crossers. Romo struggled to do that and often threw behind the WR's but he had Witten's speed down pat.
As far as interceptions go, Kurt Warner had the best line I've heard on that "every interception has its own story". Not all of them are necessarily a bad pass.