If you’re asking for Society forces, the Royal Zephyr is about as good as it gets under the MUL. The Odin is a less mobile but more survivable runner up. Since there are no canon Society vehicles with Nova CEWS or iATM tricks, the Narc/TAG combo on those vehicles makes them pretty valuable for low-skilled Society forces.
Beyond Society-specific units, the Stormcrow D is probably the best Clan Narc platform — mobile, highly survivable, and carrying its own substantial missile load. The Summoner B is basically the same thing, only jumpy. Less survivable are various Narc configurations on the Hellbringer, Kit Fox, and Mist Lynx.
Spheroids have the Tufana as probably the best vehicle platform, with the Scimitar 3050 being available earlier and more widely. The Kintaro is as a more survivable mech platform that could also be available to the Clans/Society, but the Owens D is a faster and probably more common, mech platform.