Benecchi is very nice thread and quite strong for the size. Lots of great threads out there, depends what you're tying, if your need a thread that you have to put a lot of pressure on, or for a specific purpose. Have a few threads that fill different needs. I quite like UTC Ultra, just bought a couple of dozen in 70 & 14 Denier. Lies very flat without bulk, lot of guys use it for full dress salmon flies. I also buy a lot of Gutermann, along with pearsalls Silk for tying with. All for different tying situations.
Good idea to try out a variety of various threads to see what suits your tying style and needs.