I agree with Gary many times, and this is no different.
What I am trying to get people to understand is that "best" is only in the eye of the beholder. For me, it's typically "value" driven. I don't mind spending big money, but I still want a sense of ROI to go with that expenditure.
What someone asks "what's the best ...", they need to help us help them!
They need to define what "best" they are searching for. If the topic is a filter, do the want the "best" efficiency, regardless of cost? Do the want the "best" value (defined as output/input). Do they want the "best" cost (i.e. the least expensive?)?
The point is that one needs to define the criteria one is using for the parameters of judgement, and not just leave some word like "best" hanging out there for open interpretation. Because someone like me will come along an muck it up in a hurry!
Would I put the OCOD on a Lexus for a 10k mile OCI when I intend to own it for the next 12 years? No.
Would I put the OCOD on my neighbors Lexus when he intends to trade it in next month? Yup.
Would the next owner of that Lexus view the OCOD the same way I do. Don't know. She might be a BITOGer; he may be maintenace nuetral. Who really knows?
We have no idea what "best" means to this guy, because he hasn't defined it for us!
"I'm not really looking to buy an inferior filter to save a few bucks. BUT if I can get the same quality for less, I'm there!"
In other words, he wants to have his cake and eat it too! (BTW - Don't we all?!?)
He's been using M1 filters for 10 years, but now seeks a filter that performs as well, for less money. Frankly, I don't know that one exists. If M1 efficiency is the "baseline" of judgement, there really isn't much available that filters as well, but costs less. But what he can find is a filter that will perform more than adequately for his OCI, and cost less; it just won't perform as well as the M1.
For his intended OCIs (let's just put a guestimated 5k mile limit on it; he hasn't defined it, but stated he won't do "extended" OCIs, so I'm taking a swag) I think any brand name filter will more than suffice. So, anything past a "normal" filter for his "normal" OCI is simply overkill. He could use PureOnes, Bosch, Wix, and even the premium Frams. They would all do a fine job. Not all will perform as well as a M1, but they will all perform well enough to surpass a minimum safe level of filtration. Some will save him money; some will not.
IMO, he's wasting a lot of money on premium oil (PU) and a premium filter (M1), but he somehow now wants to find the economy version of chic ... Well, you can't get there from here.
His intended OCI can be suitably sustained for a long healthy vehicle lifecycle with dino oils and normal filters. He is more than welcome to "upgrade" at his descretion, but it will cost him, regardless of his intent, and the ROI will be nowhere near the cost.
I don't know what filter is "best" for him in his situation. I do know that he'll not likely find a "better" filter for less cost that performs to the same level in his OCI plan.