My vote is always for rings , not spades as they cant shake loose.
Some terminal blocks are very narrow , designed for spades , there I simply trim the ring to the ptoper width and still have more contact area than the spade.
Single or stacked a good procedure is a star washer on top of the stack under the nut..
IF the terminal end gets warm it will expand , and then shrink back, more so if there is a stack.
The star washer puts pressure on the terminal end and assures good contact , after thousands of cycles.
Some quality mfg use lock washers on their terminal blocks , but star washers work better.
A great rainy day project as you clean the old terminal ends with a scotch brite pad .
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