Yeast for low fermentation temps

I recently read the Wyeast 1338, which is an European Ale yeast, is recommended for Scottish/Scotch ales because they have low attenuation and can ferment at low temperatures.  The 1338 says optimum fermentation temperatures are between 62-72 degrees with apparent attenuation between 67-71%.  The book suggested these beer styles should undergo primary fermentation between 55 and 60 degrees. 

The only strain I saw that had lower temperatures were the Scottish Ale (1728).  Although the ferm. temps are low the attenuation is much higher at 69-73%.

Are there any other yeast strains that would work better for these colder, less attenuate conditions or should I just use these?  Maybe the numbers have some fluctuation.

Any thoughts?

If you go for the 1728 the attenuation really isnt that much higher than the 1338 (2%). There probably wont be a noticeable difference in the finished beer. Otherwise you can make up for the higher attenuation with a higher mash temp to end in the same finished gravity range your looking for (if your an all grain brewer). On the other hand if you choose to ferment at a temp lower than recommended it will be a slower fermentation and you might not have the ester production needed for a certain style and so on. Also you will need healthy and active yeast at lower fermentation temps so make sure you make a good size starter/aerate your wort or the yeast could peter out before you reach your target final gravity. If nothing else do an experiment and split the batch and pitch both types and test the differences yourself. Good Luck!

You may get the slight Scottish peat note from the 1728, whereas 1338 is likely a little cleaner.  I've seen 1338 cited as an altbier yeast, so it may be fairly clean. 

What we think is true practice and what is actual can sometimes be quite enlightening for us to examine.

http://barclayperkins.blogspot.com/2009/08/william-younger-fermentation.html
http://barclayperkins.blogspot.com/search?q=scottish
http://barclayperkins.blogspot.com/2009/10/scotland-vs-england-kick-off.html
http://barclayperkins.blogspot.com/2009/08/thomas-ushers-beers-1885-1889.html

I hope you enjoy reading some of this material.