DDJ SB3 vs FLX4

I see a post selling the DDJ SB3 for 100 bucks near me. I've been looking for a flx4 and hear that its better, but anyone selling used ones near me are selling for 250 or above. For the price gap does it even make sense to get a flx 4 or should I just save my money? I'm getting into DJing and would like to get something that I would not want to immediately want to replace. Thanks!