Fantasy Baseball Debate - Part 1

Which pair of third basemen would you rather have on your fantasy team? Assume Al, Bob, Chase, and Dave are on 4 different MLB teams. Assume the stats listed below are what their stats will be this coming year.

Name	Bats	R	RBI	SB	HR	AVG	VS LHP AVG	VS RHP AVG
Al	Switch Hitter	100	100	25	25	300	300	300
Bob	Switch Hitter	100	100	25	25	300	300	300

OR

Name	Bats	R	RBI	SB	HR	AVG	VS LHP AVG	VS RHP AVG
Chase	Lefty	100	100	25	25	290	215	315
Dave	Lefty	100	100	25	25	290	215	315

As you can see, Al, Bob, Chase, and David are nearly identical except with their batting averages. Al and Bob are switch hitters and are 300 hitters against lefties and righties. Chase and Dave are both lefties, and hit 315 againt righties, 215 against lefties, and 290 overall. Which pair of third basemen would you rather have on your fantasy team?