I'd lean towards the what the manufacturer specified, or the equivalent. You did not state what it is you are working on here, be good to know what it is actually LOL !
In simple terms, as I understand it, modern detergent oils will hold contaminants in suspension, (to what degree it does that before it would settle, I have no idea).
Non Detergent oils will allow contaminants to settle in a deep sump. One good example is the 2 cylinder vertically orientated starting engine on an old caterpillar, like my D7. It has 2 deep sumps that would isolate contaminant accumulation between oil changes and is a splash lube engine. I think in that application, I would still prefer the non detergent oil, but have run modern detergent oil in it. Of course it would get changed often any way.
If you suspect the engine having a lot of sludge build up, I would agree about the concern of what happens when you use detergent oil or do something to flush and clean, depending on what it is, and what could get clogged, hopefully there's a way to do it. I have changed oils at a more frequent interval initially, when I suspected it had not been changed enough, noting if the oils appearance was better after some run time.
I've seen sludge accumulations in oil pans on small engines that were not taken care of, it is nasty, and surely would contaminate new oil, darken its appearance. Maybe its possible for the pan to be removed on this for cleaning, if you suspect it needs to or you can see it needs to.
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