Before this titanium era I always used a snap of some kind between the leader and the fly. My first candidate for a snap was a Duo-Lock-type Rosco. It had its good things, it was easy to handle and it gave the fly a nice, free movement. However, it was not very reliable as I broke many of them while casting. It could also be opened by biting so it was not my top choice.
The second candidate was a sturdy no-name cross-lock snap. It happened to be quite reliable as it still held the fly even if it was open. This was because you needed to twist the eye of the hook through many tight curves before pressing it shut. And when it was open, it still held its shape as there was another wire to support the hooking end to. This was also its worst feature and the reason why I abondoned it in the first place. It was so god damn difficult trying to put those pike hooks on. Loud "PERKELE!!" was heard many times before my rig was ready for fishing.