AR's aren't the only Black Rifle that AR owners would be all over.
But I/we lurve them because of what they are and what they represent.
Even though it's development has roots in military theater.
It's what we (as civilians) have as the de facto best of breed for a relatively affordable, proven reliable, tactically oriented
sport rifle platform that can be optimized for the users specific requirements.
Here in Banada, civilian ARs are toys. If what you are looking for is a shooting toy/sports equipment.... The AR is hard to beat.
If you
need a black rifle for some other purpose, And the only other wholy legal option is hunting. Then there are better (read legal) black rifles from a practical and functional standpoint, M14 perhaps.
As a Canadian, I think your decision is pretty simple based on your requirement.
Do you need a do-it-all black rifle? Not an AR
Do you want a toy to play at the range? = AR
Having said that.You are kidding yourself (as ALL CGNers know) if you think you will only be able to afford only one. Where there is a will, there will be a way.
IMVHO, Every restricted firearms owner worth their weight in salt should own an one AR, one Glock or 1911 and one non-restricted .22LR rifle. These are the staples. Everything else is gravy.
Let us know which AR(s)

you end up getting.