I have the Obliq, and I love it. Super thin, nicely protective, and the grippy material in the sides makes it feel very secure in my hands.
It is a tiny bit looser than I would like. Not so loose that I would stop using it, but still a little bit. The good news is that as of last Thursday, Obliq has changed the case to make it a little tighter, and has sent me a new one for free. Apparently they are sending the updated to model to anyone who bought the old one and would like the new one.
So, great case, and great customer service.
I haven't used the Spigen, but it seems a little thicker and doesn't have the side grippy panels. I have used Spigen cases in the past, so my guess is that both will serve you well.