I don't know Where you guys buy your chains. 0.24 a link at Baileys for 3/8, low pro, narrow kerf (Carlton) chain. 43 links for this bar is $10.32. Oregon 90PX is 0.36 per link, or $15.48. Amazon has Oregon R44 Advance Cut Saw Chain 12" loops, for $15.06 (34 cents a link). Add a few cents for a preset to spin it down a link.
The NK chain puts less load on the smaller motors that most pole saws have. As I have noted elsewhere, the Oregon Type 90 chain also cuts fairly aggressively, and holds up well. Another one of my pole pruners uses 1/4" chain, but it does not cut as well IMO.
Philbert