For the log end, I prefer this style choker hook. I have not have any problems with it becoming disconnected from the log.
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I don't know if this style can be found preinstalled on a chain you can buy. I had to change out the hook ends on mine.
edit: there is this choker chain with the hook preinstalled:
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I use the spring latch style you posted to connect to the tractor clevis on the drawbar.
There is also this style latching hook which I think may be more resistant to bending than the spring latch on the other type of hook, but I haven't used it to be able to say for sure.
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