128 pcie drive performance

I'm considering purchasing my first Mac. I've been a *NIX user since 2006 with the exception of the many hours I enjoy installing updates for an OS I don't use and renewing anti-virus subscriptions all so I can use a mobile phone.
What has me sold is the performance of the PCIE drives, and I would potentially find the default OS tolerable. The problem I am concerned with is the really BAD, deceptive marketing regarding the read/write speed of the 128 size.  I refer to the 312.9MB / s write of the 128GB SanDisk found in the 13" vs the 676.7MB / s write of the 256GB Samsung found in the 15".   I would return the purchase if I ended up with the lower speed so would like to avoid that hassle for all parties.
What is the story on this with the current model?  Same goes for Macbook Air, haven't decided between the two but I hate to take a performance hit when replacing a very old laptop.  Money is an issue, I'm limited to the 13" versions, and the 128 drive - unless I go with the Air.  Again, same PCIE SSD or flash in these two devices?  Didn't get an employee to acknowledge there was a difference after dragging myself to the Apple store.

My local store did have the 256GB apple ssd sm0256f in the 13" model, only wish there were a way to confirm all came that way.  It will be worth the paying of sales tax for that.  It is out of my price range, but when looking at benchmarks of that particular dirve... wow.
http://www.harddrivebenchmark.net/hdd.php?hdd=APPLE+SSD+SM0256F

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