It's a Ryobi TSS102L 15-Amp 10 in. Sliding Miter Saw with Laser
Any blade recommendations for this one? And table saw and circular blade recommendations would also be welcome, heck even knowing what type for what situation would be goof to know, with so many varied combinations and suggested uses it's a little confusing as there seems to be no straight answer that I can find.
Also, I've seen a few posts about Diablo blades are good if made in Italy but not if from China, how would I possibly tell this aside from being in a store and being able to see the blade in person? When I look it up on Amazon (D1080X) the specs state that it's made in China, but the image isn't the best so I can't read the fine print on the blade. Not all Diablo blades state (or show) where they are made.. and my local HD has a pretty pathetic selection of better blades as I'm sure they are mostly catering to the construction crews that want cheap disposable blades for job sites.
I looked up a few other of your suggestions (albeit for the Straight Miter)
1. Irwin Marples 80T on Amazon and I get two results, one states a ATB/Neg M at $80 more ($120) than the other non-Neg ($38), that's quiet a steep price point for the Neg which I think was what you were suggesting
2. Freud LU74R010 $70, little on the high side but not out of contention.
3. Infinity 010-080 $80, no reviews on a product makes me nervous especially at a premium price point.
4. Oldham 100PT80, price point is nice but I could find almost zero information about the company, blades, reviews etc and that makes me leery to spend money on this product as I like to "know" about the products I buy. But at $20 it's not a huge loss if they aren't very good.
Reviews can be useful, but don't let them have too much influence over what you buy are don't buy....many reviews aren't worth the electrons they're written with, but some are....it's just hard to know who's credible and who's not. As many as 30% off all online reviews are thought to be completely fake! Do the research, and you'll be fine.
No worries about Infinity, they've been around more than 13 years, and are some of the best blades I've used, bar none at any price. It's owned by David Venditto, who's the son of Carlo Venditto, who was president of Freud, CMT USA, and Jesada, and helped put all of them on the map...he's legendary if you follow the saw blade market closely. David is an engineer by trade, and saw blades are in his blood...he grew up around this stuff. Infinity is a reputable company with a top shelf product and a reasonable price. The 010-060 is also an excellent choice for your SCMS and TS.
Oldham is a throwback name that's been around forever....once upon time they made some really nice blades...such as their Signature line. They've since been bought and sold a couple of times, and are mainly now relegated to cheap low end Chinese made knockoffs sold through Home Depot. Oldham and DW were under the same ownership at one time, and the blade in question appears to have been a kissing cousin of one of the better DeWalt blades....a short run stamped Oldham Pro instead of the DW Precision Trim series. The DW equivalent gets good marks and retails for $50-$70. Since your miter saw turns out to be a SCMS, the 10° hook is a bit steep, so probably moot point for that saw, though would be good in your TS. (same is true of the Irwin Marples blade). Probably best to keep the hook at 5° or less for the slider.
The only way to tell where the Diablo blades are made is to look at the blade or the packaging. I have not seen officially that they're made in China, but have read from credible sources that some are....so it's really just a heads up. Made in China doesn't necessarily mean poor quality, but companies don't send manufacturer there to improve quality....it's make them cost less to make, and I'd prefer not to support that effort. It's a personal choice.
The Freud LU91 is a popular choice with the appropriate hook for a slider. The CMT ITK Plus P10060
shows promise for a ~ $40, but I haven't tried that one personally.