these questions and not even specify solid or laminated
Agree. First & foremost the buyer needs to make decision on 1-use disposable laminated bar, or longer life rebuildable solid bar. Usual cost equals quality. Seems many prefer laminated for lighter weight.
Personally only buy solid RNB bars (replaceable nose bars). Just my preference that sprocket tip serviceable ($20) without buying new bar $$. Have Oregon bars over 40 years old & wearing 3rd or 4th sprocket tip.
I've never spent money in Sugihara or TsuMura but they're nice products. Just cutting firewood been happy with Oregon power-match bars (now power-cut?)
My experience has been good on Oregon style 1-rivet replaceable tip bar. Many manufacturers; Oregon, Forester Pro, Laser, Carlton, GB. I thumbs up the Forester Platinum series... doing fine service on 3/8 .050 D025 Stihl. But, imo the Forester .325 & 3/8 tips is a bit softer than Oregon OE 1-rivet sprocket. So, when worn at 7 o'clock just install Oregon tips. Never have failed a tip.
Bought an Husqvarna X-tough .325 bar on a whim as cheap. Real disappointment, cheap feel, non-greasable tip. Hung on peg might use down the road.
TsuMura L&T # 365SK2 18" .325 .050 72dl [ex., replaces Oregon 180RNBK095]. Can find reasonably from ArcherPlus.com
Edit, apologies 1st OP. This applies same to Echo 590 but norm tends to be 20" 70 dl odd ball lengths. If look can find resized 20" 72 dl for Echo (D176, right?)