Well you must indicate your laptop model first so we can give a proper recommendation of compatible SSD's available right now. But if your laptop has m.2 nvme slot go for that kind of SSD, and use your extra sata slot for backup drive using sata SSD or HDD. Currently there are a lot of brands that offers reliable and fast transfer that will not have a problem with Dell laptops. I also vouch for the samsung ssd, crucial and wester digital are also option to consider. It will just boil down to your budget.