I'm no electronics expert so I'm not going there, but I'd imagine the evolv item is better in overall build quality and customer support, although I've never had issues with any Kick type devices... the flip side being that you can buy nearly 4 Smok Kicks for the price of 1 evolv Kick. If mod height is a concern, then the Crown wins hands down.
As to the shrink tubing... shrink tubing is cheap, and I already own a heat gun. The ground plunger in my Smok Kicks work fine... but then, I expect them to. The ground "pins" in my Kick 2 works even better, leaving little "bites" in the tube.
Get any of them... unless one is DOA, you're probably fine.