Nice review of the T500 here.

https://www.pcworld.com/article/2105564/crucial-t500-nvme-ssd-review.html

TL;DR: plenty fast until the DRAM cache fills up. Seems like a good choice for an OS drive.

T500 IS FASTER:

|| || |Sequential Read|7400 MB/s| |Sequential Write|7000 MB/s|

P5 plus:

|| || |Sequential Read|6,600 MB/s| |Sequential Write|5,000 MB/s|

T500 IS FASTER:

Sequential Read

7400 MB/s

Sequential Write

7000 MB/s

​

P5 PLUS:

Sequential Read

6,600 MB/s

Sequential Write

5,000 MB/s

Check the specs and decide on your choice. Also, depending on your workload maybe the best option is to get the cheapest drive.