The change to the stats is more of a set value thing, it is a perk that is on multiple weapons and not just a single one. Is all dependent on the other ones there are to select, sometimes it is better and other times it is worse. If it hardly changes the 2 and has a big impact on the 1, then focus on the 1, unless the 1 is something of no value such as stability on a rocket launcher, in which case you can just ignore it all together really.