Both drives are pretty close in overall performance.
The only real differences are these:
- The Samsung is better at burst data typical of a client workload like an OS and games drive; It has faster peak speeds and higher IOPS (reacts quicker).
- The ADATA will be better for a production drive - saving/copying large project files, video editing etc. It will not slow down like the Samsung will when it is worked really hard.
Personally I'm not keen on Samsung, they're a pretty shady company and they've screwed millions of customers over in the past, so given how similar these drives are in performance and price, I would choose the ADATA simply because Samsung SSD have a few black marks on their record that I can't ignore.