sx8200 pro

So I want a 500gb ssd for my laptop (that support PCIe 3.0), which one should I consider? Options are sx8200 pro and samsung 980, and maybe crucial p5 if it's better. 980 is 2 years newer, is it matter? What about being dramless? Is it worth to buy a 2 year old ssd with dram instead of dramless...