I run my DAW on a laptop specifically because I do a lot of live stuff and lugging a tower around would kill my aging arthritic knees. As long as the laptop is to a spec that would run the DAW well on a desktop, then you should be fine.
A couple of limitation:
Screen real estate can be a major limitation. When I'm doing multitrack stuff at home, I have a large second monitor I plug in. Also, the ability to expand/add features is much more limited than on a desk top so make sure you have whatever it is you're going to need in terms of drives etc. from the start. That said, I have a couple of USB3 ports and USB3 external drives work just fine for me.
(I'm not on Sonar, though I've use it in the past.)