Nobody is going to notice the difference between Samsung, Vertex, and Intels in speed or performance, that's common sense, they all have .01 latency.
The difference comes from sustained transfer speed, Vertex can write 180-200MBps, Samsung as far as I am seeing can do 170-200MBps as well but Intel will always be limited to 80MBps. All of them can read at 250MBps. Both speed are in sequential type of transfer.
In terms of random IOPS (people will notice mostly when doing a lot of multitasking with small read+writes at same time), Intel is still the best but it's so high, it is not needed for most of casual users. Vertex is better than Samsung at this moment as well.
Now as for steady state performance, apparently Samsung is doing far worse than Vertex and Intel in seq and random IOPS.
Note: for the best compatibility with pre-unibody mac laptops, Intel is the way to go. There aren't a lot of Mac issues with Intel SSDs, Intel seemed to fix most of the issues. Samsung seem to have some kind of performance issue with Macs which is still not clear at this moment, it is brand new to the market. Vertex has both the Bootcamp issue (EFI) with pre-unibody mac laptops and some nasty sleep/wake issues with all macs. according to OCZ they are working on resolving it for the next firmware which is scheduled before the end of May.