Hard to answer without some more details like:

1. Budget (<$100, $100-200, etc)
2. Laptop details (type, size, etc)
3. Preferred style (briefcase, messenger bag, backpack, tactical vs casual vs professional, color preferences, etc)
4. Specific needs (TSA foldout, water resistance, convertible style, lots of organization, lots of external pockets, etc)

I have a Lenovo W530 which is hard to find cases that'll fit it while cases for Mac Book Pros are all over the place.

I have several Timbuk2 messengers and backpacks which I like a lot, the quality is good and price tends to be between $100-150. I'd say most of their bags are casual which work fine in most professional settings also. Tumi on the other hand has a lot of nice bags, probably can't find many for under $200 and most are probably over $300 but tend to be very professional and won't look out of place in any boardroom. The STM bag you linked is generally considered a solid bag with a good reputation but I've never used them.