Yes, much better, I do not like the clip on the zing (I also don't much care for tanto's but the clip is my big issue with the zing). The rat-1 takes a benchmade deep-carry clip, a very standard bolt pattern, even if I didnt prefer deep-carry I just think the zing's clip is ugly.
Personally I like smaller knives so if I were in your position, and didnt already own both, I would buy the Rat-2 but I do still enjoy my rat-1, its one of my work knives (it gets carried along with a mora when I'm working on cars or doing dry wall or yard work or anything else Im worried about loosing a more expensive knife). Both the rat-1 and the tenacious are rather large knives, are you sure you need that/are expecting that size? The Rat-2 is really a great knife and no less capable than its big brother.