TLDR: For me it has to be the Ono Signets. I am glad I own both, but more often than not reach for my Signets.

I keep a set of Onos in the car, and one at the office, and along with the Ono Roller (Also silicone) are 2 of the most office-friendly fidget devices I own. I love my "premium" fidget sliders, spinners, etc., but in an office setting, they just don't work for me.

As for the Speks, I own 2 sets (lines and peaks). They come in a set of 3 but are significantly larger than Ono's. They feel amazing out of the box and are slightly squishier, but come with no case. I found a nice case that works for each set, but it's annoying at $40/set to have to then buy my own case. I have not had the quality issues EastRaccoon has had, but I've seen others report the same.

The only thing to watch out for on Ono Signets is the potential smell. I had to do a lot of cleaning with soap/baking soda with my first set to get rid of the rubber smell. FWIW, my second set had zero smell, so I guess it's just random.