There is really no right answer to this question.
It all depends on HOW you use the DAW and what features you use or don't use.
True, at this exact moment in time, X1 has it's problems but it has great potential.
It is kind of like asking which is better ... a 12" ruler or a full 36" yardstick.
Depending on what you are measuring and how much free space you have to move around, there are times the smaller 12" ruler would be a better choice than a 36" yardstick.
From my perspective (which is only a personal opinion) ...... if your DAW is mostly used as a multitrack recorder and advanced editing tool, I think Sonar 8.0 is better from what I have seen. Especially if you own and use lots of outboard high quality gear.
By contrast, if you don't already have pro level preamps, channel strips and use your DAW as not just a recording tool ..... but a music composing and creation tool , it appears X1 may end up being the better option once they work out all the bugs.
But like a debate between which is better Porsche or Ferrari ......... it really comes down to personal preference more than anything else.