Sharp chain is the best chain
Selecting a chain for what you are cutting is also important. If we are talking cutting rounds for fire wood:
(Oregon makes Husqvarna chains.)
I'm told the Stihl RS chains hold an edge better but are a little harder to sharpen, chromed teeth, Oregon LGX is the close equivalent.
The Oregon LPX is also a good chain, the one I've used for years with good success, (this year trying the Stihl RS)
I still have some of the safety chains & use them now & then. Great for liming & pruning & small jobs, less kick back.
For cutting fire wood, I use the round chisel. This year I'm trying the Stihl RS, from others here & a local saw shop, I'm told they hold an edge longer.
But again, it depends on what you are cutting, Some chain is made for cutting dirty wood & stay sharp longer when in the dirty stuff.
Even some carbide teeth chain out there, just high dollar & requires special sharpening.
Most Box stores don't sell the full chisel chain, not for home owners who rarely use a saw because they have the potential to kick back more if not operating the saw properly. When I quit buying box store safety chain & started using the round chisel, (Oregon LPX) what a big difference in performance. (Oregon LPX & Stihl RS3 have some kick back reduction with a hump on the drive link yet has a full chisel cutter for fast cutting & when using the tip of the bar they have less kickback. A nice feature for me, I use the tip of the bar allot)
The round chisel is the easiest to sharpen & cuts fast .
According to the tests, the square chisel is the fastest cutting, but it is an art to sharpen them.
No perfect chain for all applications. (But a sharp one is important)
For cutting most logs into rounds for fire wood, a full chisel works the best for me. Kick back is more dangerous with it but for an experienced user, we know when we use the tip for cutting to expect more kick-back energy. Most of our cutting is with the flat part of the bar cutting rounds across the grain& cutting speed here is what we are after.
If your saw bogs down frequently, maybe you need a skip chain, (or a bigger CC saw). Longer bars (over 24" usually) use a 1/2 skip or full skip, to help keep RPM up & clear out the wood chips from the cut. I tried a skip on my 20" & got poor performance, now it's a back up chain.
Some references :
http://www.baileysonline.com/saw-chain-cross-reference-chart.asp
http://www.stihlusa.com/chainsaws/types.html#RS
http://woodcuttersupply.com/Saw_ChainReference-.html
http://www.ereplacementparts.com/article/1507/Chainsaw_Chain_Measurements_Sizes_and_Types.html