eta 2894 is eta 2892 + additional chrono module
eta 7750 is originally design chronograph watch
which 1 better, depend what u want?
i prefer 7750.... because it is bigger, tougher and originally design for chronograph...
2894 will be more difficult to service n repair...
some may dont like 7750 due to its wobble effect during winding n it is non bi direction winding...