La Bella are known for balance all the way around in tone and feel. I tried a 4-string set of LTF's, and liked their tone; I only changed out for 760FL because I needed a medium scale set. If you like the feel of the TI's, you will love the feel of the La Bella LTF's, especially since they changed their formula a few years ago and the A string is now balanced with the rest of the set.
Caveat: all flat wound B strings, indeed all B strings on a standard 34-inch scale, will be problematic, because of the difficulty in getting the balance of tone to match the rest of the set, but still thick enough to have enough tension for stability in tuning. I solve the issue by using one gauge smaller, for example, a D'A XL130 to go with a set of their 170BT 45-107 sets, and tune up from B to C. Since a flat B string is even smaller in diameter by comparison to try to get the overtones to match the rest of the set, tuning up would also a consideration for flats. Of course, as with all players being different, YMMV.