I've had two 5-24 and had them almost exclusively strung with flats.
This bass is so bright that I felt it really needed flats.
I didn't like TI in them; they are too dull, and the low tension can definitely be a problem. I have a love/hate relationship with TIs. Have used them on and off for years, but I think they are just too dull, and you end up missing too much of the character of the bass.
So, my experimentation took me to Sadowsky flats light gauge. Ultra high quality, they last a long time in good shape, the have a bit more tension than TIs, but still very flexible but most standards - the perfect tension for me. And my favorite part is that they are bright enough to slap effectively on the 5-24.
I'm also familiar with other flats, like Fender, EB, D'Addario, and I have to say Sadowsky flats as by far my favorites.