Yes, every sata standard is cross-compatible. You'll probably end up with a sata3 drive, there aren't any sata2 drives really worth getting even if you only have a sata2 port.
Data bandwidth is pretty much always limited by the sata port now, if you look at the pcie drives in newer Macs, they're significantly faster than sata3 drives. I wouldn't worry about it too much though, sequential read/write speeds are only one measure of performance in hard drives, there are multiple others than aren't significantly affected by moving to a slower port.
Hybrid technology is alright, but suffers from a few problems:
1. Hybrid drives don't have enough cache. Nobody builds caching solutions with enough SSD cache other than Apple with their imac Fusion drives, or custom builds if you buy a separate HDD and SDD to set up with caching yourself.
2. Hybrid drives (and pure HDDs) take more power than SSDs, which on laptops means less battery life.
3. Spinning drives are one of the easiest things to damage when dropping laptops.
I find 250GB drives to be pretty much the sweet spot for average laptop users now. Something like this is good at that size.
Data bandwidth is pretty much always limited by the sata port now, if you look at the pcie drives in newer Macs, they're significantly faster than sata3 drives. I wouldn't worry about it too much though, sequential read/write speeds are only one measure of performance in hard drives, there are multiple others than aren't significantly affected by moving to a slower port.
Hybrid technology is alright, but suffers from a few problems:
1. Hybrid drives don't have enough cache. Nobody builds caching solutions with enough SSD cache other than Apple with their imac Fusion drives, or custom builds if you buy a separate HDD and SDD to set up with caching yourself.
2. Hybrid drives (and pure HDDs) take more power than SSDs, which on laptops means less battery life.
3. Spinning drives are one of the easiest things to damage when dropping laptops.
I find 250GB drives to be pretty much the sweet spot for average laptop users now. Something like this is good at that size.