Just opinion, but...
I like the TI 12s. I guess each guitar is different, but to my ear they sound good on my X150 (all laminate) and they last a looong time for me, even with heavy use. The low E is a bit thumpy but useable... the rest sound just right, and the low E doesn't get much use unless there's no bass player anyway.
I don't have an X700 but I do have a few of its direct ancestors. The big fully carved archtops (like the X700) are a lot livelier and serve another purpose altogether it seems to me. I think of them as primarily acoustic instruments. I have a '47 Triumph but only use nickel-rounds on it (nickel because I will throw a DeArmond on there now and then) and for that I like the Dean Markley Blue Steel because I like the tone and because they come with both a wound and an unwound G.
My wife often plays the '48 Broadway and she prefers flats (normally a bit of a no-no on that guitar) but for that application the D'Addario chromes (12-52) seem to work well and sound OK, in part because she always uses the DeArmond and some sort of amplification.
Anyway, that's probably more than you wanted to know, and the way I do it works for me but that doesn't mean it will work for you. Trust your ear.