There was a time, not long ago, that virtually no laptop screen could be trusted for serious color-managed work. I suspect not much has changed. There are literally hundreds of posts, threads, complaints, etc. about this on the web. If you would like, I can send you an annotated list of a dozen or two of these articles. Even worse, even if you use a hardware calibrator, on many laptops the improvement is often minimal, and unfortunately, the average or maximum color error ( delta_E) after calibration is rarely reported by low-end calibrator software.
Maybe this has changed -- maybe not. I have no experience with the two screens you mentioned, and I suspect that most other photographers will be in the same situation. Since you are posting here, I assume you have looked thoroughly for comments on these two screens and are not finding much useful information. In that case, I think the only reasonable approach is to have a heart-to-heart discussion with the company that's building your system and ask (a) their opinion, and (b) ask if they have performed hardware calibrations of these two choices including a measurement of the maximum delta_E. If the better one has an adequate maximum delta_E, you can then place your order with them in confidence.
If they refuse to do this (even after you try to convince them how much having this capability will benefit their sales ;-) ), then, I suggest purchasing the cheaper of the two and using the extra money to buy yourself a good desktop monitor that IS designed for color-critical editing (eg, an NEC with NEC's Spectraview calibrator system).
WRT the different gamuts of the two screens you mentioned, obviously, all-thing-being-equal, the larger gamut is preferable. The reason is that a wide gamut monitor will show you small differences in color / tonality that will be utterly invisible on a more modest monitor. There are horrible examples of poor color correction because of a limited gamut monitor in practically ever few posts on photography and photoshop websites. Even worse, the people doing this have absolutely no idea that anything is wrong and think you are just picking on them needlessly if you point out the problem to them.
The best of luck,
Tom M