The TBAC is a nice can, but I look at it as more of a speciality can. Since this is your first can, I would use versatility as a priority, as you will want to move it to different hosts. I have 14 cans, and will be building my own soon just for fun (and to avoid the long wait... form 4 times are LOOONG)
The Omega is a proven performer. Set the standard to beat. Versatile mounting system, can use direct thread or Plan B for your precision shooting and ASR or Plan B on other guns. I use both Plan B and ASR, and while ASR works fine, I prefer the Plan B. But there are more mount options on the market other than these two. I have 2 Omegas.
The Vox and Nomad are direct competitors to the Omega, and use the same thread pitch for the same mount compatibility. Too new in my opinion to make a solid judgment, but they look promising.
Either of these three, because of their ability to use a VARIETY of mounting systems, would easily be my choice.
But seriously though, you could still buy the Omega and sell the ASR mount and device then buy something else like Q plan B or Griffin plan A. I like taper mounts myself but do have an ASR mount as well. The reason why ASR gets a bad rep is because user error. The lock ring must be fully open when screwing the can on. What guys do is they get in a hurry and open the lock ring but grab the can by the body and some of their hand will be in contact with the lock ring as they're tightening the body. This closes the lock ring slightly and they think the can in bottomed out but it's not. Couple shots later the can flies downrange. With ASR you need to be mindful of what you're doing
