Rask played 55 this year and put up better numbers
If you count playoffs (since you are for Rask evidently) Price played 79 games that season and had a .925 SV%. Not as good as Rask in that department but the more than 20 additional games could have more value. There's certainly a debate as to which season was more valuable but there's not much debate overall, yes Price has played a lot more games and that has value but he's coming off a pretty bad season and Rask has never had a dip like that. You have to go with Rask right now.
I do suspect playing for Boston of late in someway inflates a goalie's stats but it doesn't pump Rask from .910 to .930, he's still elite.
I'm satisfied keeping Price. Obviously Rask vastly outperformed him this past season. But I'm optimistic that the new goalie coach will help get Price back on at least a level footing. The way he was playing towards the end of last year was just so uncharacteristic and ineffective that I can't really take it too seriously yet, and believe instead that he'll readjust easily enough.