At this point, if you haven't already purchased your ace in the hole you are well behind the "Observe, Orient, Decide, Act " cycle as compared to your peers. As a result, the best information about the optimal brand to buy is entirely moot if there are none left in Canada for sale. My advice is to buy any reputable AR15 brand that you can still source. Buy a complete rifle/carbine and not just a Lower Receiver in case the Liberals word things to prevent future importation and sales of AR-unique parts.
As of this morning Wolverine Supplies still had some Daniel Defense rifles in stock. If those are too rich then buy something cheaper if you can find it, without stooping to NEA/BCL quality (or utter lack thereof).
Don't dally, as your options are narrowing at a very rapid rate. Even if you don't get the exact configuration that you want, buy something in an AR. If they do prohibit them by OIC then grandfathering will likely occur, allowing you to buy, sell and trade amongst fellow registered AR owners so that you can eventually have and enjoy the exact rifle/carbine of your dreams.