[gaston]

pro of jake's brakes:
.lower price, although not much significant
.minimal work of installation for having front discs
.ventilated discs, lightweight
cons:
.only front discs
.will work only on proprietary spindles.

pro of san clemente's:
.4 disc brakes
.rugged construction
cons:
.more detailed work and mods to be done for installation.
.will need to send them spindles for reworking or buy modified spindles.

Both will need 10 inches rims or bigger, 12 inches recommended.
more opinions...