I've read a few threads like this before and they're great, the only problem is every time I think it through there's a different answer depending on the job
The best saw for limbing is whatever is big enough to get it done comfortably, sometimes an ms150t, quite often a 200t
On more than one occasion its been an 088xb as it's already in my hands.
I happily recommend the ms170, lightly modded, I used one for months limbing to feed a chipper, a brilliant saw! One handed when necessary, light, well balanced, good on fuel, low vibe, shares PS/PM bars and chain with stihl top handles, cheap, durable, internal clutch and cuts pretty well with a good 12" chain in hard wood. A 346/550 is actually quite cumbersome in comparison and 3-4X the price new.
Yeah, a top of the range pro saw will cut quicker but horses for courses, sometimes that's irrelevant
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