It all depends Badger, different choices for the different bugs..and even for the different stages of a grow! and this is due to some predators preferring higher humidity and some tolerating lower humidity (same with temps)..
It also depends on whether you want to prevent or cure..
So for spider mites specifically (for example) ;
Amblyseius californicus - They can also tolerate low humidity so a good option for flower period too. Choose sachets for preventative, or select the 'loose' option if you spot any spider mites.
Amblyseius andersoni - These mites are best for outdoors, can tolerate colder weather but you can use them indoors. This predatory mite feeds on two-spotted mite/ red spider mite (Tetranychus urticaea) and other mites including Russet hemp mite, Broad mite, Cyclamen mite, Carmine mite, Russet mites and European mite. Use as a preventative.
Phytoseiulus persimilis - A great choice if you've already spotted the buggers, but you need to mix with one of the above (I'd go with a combo with californicus), as these particular mites don't like low humidity too much!
To put it into perspective, a single Phytoseiulus persimilis mite can eat 5 adults and 20 young spider mite larvae per day, and you get a starting choice of 1000 of them!
Unfortunately as great as these preds are, if any grower is in late flower and you're seeing webs, then it's already too late

....for best results, I'd recommend using them as a preventative in the early stages of a grow with Amblyseius californicus (about 2-3 sachets per plant), then hit them with a batch of Phytoseiulus persimilis (on top of the Amblyseius californicus) if you actually see any spidermites

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