The replica daytonas with full working chronos are too thick, and the movement used in them is a lot less reliable.
The ARF ones have chronos that work partially (up to 60 seconds), and the correct thickness, or at least one which is much closer vs gen.
The movement, though not as reliable as say, the A2824 or 2836, is still more reliable than the modified A7750 sec@6 with full working chrono.
I agree with @themannier though, the non working chronos are not issues at all. Let's face it, chronograph functions on watches these days are 99% unused and serve more as decoration, adding complication to the dial. I hardly even touch the chronos on my gen daytonas.
In this hobby, it is often that we make decisions about what we can live with, and what we cannot. For me personally I will rather have the correct thickness, a more reliable movement, and I can live without working chronograph. You have to make your own decision about your preference though.