If you have a choice of the same lens, in the same condition, and a similar age and selling for a similar price, which would you buy?

Would you go for the slightly newer Copal shutter or the slightly older Synchro Compur with it's extra blades in the iris (which purportedly gives better bokeh)?

Just curious as I am looking at buying a 240mm Symmar S f5.6 and the supplier has two in stock, one in a Copal shutter and the other in a Synchro Compur, price is very similar as is the condition and the serial numbers.