Which rear main seal is better?

[swooper]

The one with the spring or without? Thanks.

[swooper]

Looking at:

11-14-2-245-364-m30 Elring klinger with spring. Original style

Or new version without spring:
11-14-2-249-533-m104. cfy freudenberg

Both from Pelican

[jlevie]

A main seal can prematurely fail because it is an inferior part, it is installed incorrectly, or the sealing surface on the crank shaft may be grooved. in the last case, seating the seal to other than normal position is cheaper than replacing the crankshaft.