Shouldnt really matter as long as the chain is tight. Actually the lone chain is stronger without a binder on it than one with. Grab hooks tend to put more pressure on that one link and from all the load tests i've seen thats a very high failure point, and a binder has two of them.
The load tests we have done for safety departments of different trucking companies using G-43 and G-70 chain and ratchet binders had different results. They broke at various links in the chain, not at the connecting points. The binders never failed. A 3/8" G-43 tie down chain is rated for 5,400 lbs straight or with a binder, same on G-70...rated at 6,600lbs. The one thing you really have to lookout for is the import ratchet binders especially in the 3/8", more than not they are rated at 5,400 lbs WLL, so if you use with a G70 chain, that binder is the weak point if you are using the max WLL of 6,600lbs for the load you are carrying.
Actually alot of the oilfield trucking co. are going to grade 10 overhead lifting chains rated with a WLL: of 8,800 lbs which come tagged and certified for tie-down, then they can also use the same chain for unloading. Granted a grade 10(100 same thing) is alot more$$. I state this though, all tests were using Domestic equipment.
I can tell you from seeing the pull tests on the China made stuff, just be careful. Some broke over the WLL some broke way under the WLL. If you are going to buy the import, try to get Korean made....alot better than the China stuff. By design chain is made to be used with hooks and I dont understand or well I will disagree with that statement about hooking on the chain is the weak point.
If we were talking wire rope, then that would be correct, putting an eye into wire rope weakens it and the ratings are adjusted accordingly. You do not find that in chain at all.