Which one has a zirc fitting for regreasing? Go with that one. If they both do/don't, go with the cheaper one.

Side note: If the ball joint doesn't have a zirc, fill that puppy up with grease before you install it. They never put enough in there and they will fail that much faster. It's cheaper for the manufacturer and they get the possible bonus of another sale in the future since you might still actually have the vehicle. :-|

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Sgtsandman's Work in Progress
2011 Ranger XLT, 4X4, 4 door Super Cab. 4.0L, 5 Speed M50D-R1HD, 3.73:1, 8.8" open differential, Jason Pace cap
2019 Ford Ranger STX FX4, Super Crew, 2.3L Ecoboost, 10 speed automatic, 3.73:1 with rear locker, Leer 100XR cap