What are the best concrete vibrators for compacting large slabs?

Anyone here worked with concrete vibrators for compacting large slabs? I’m trying to figure out

what actually holds up on site when you’ve got a big pour going on and the mix starts setting

faster than expected.

Had a situation last month where we were pouring a parking slab and the surface ended up with

some honeycombing because the vibrator we borrowed from a local guy kept cutting out mid

run.

That got me digging around and I was browsing listings on alibaba just to compare specs and

see what different industrial models offer, and honestly there were so many variations in needle

size and frequency ratings that I got more confused than before.

Some users online say high frequency is best for dense reinforcement, others swear by heavier

heads for deeper slabs, so I’m stuck trying to figure out what actually matters in real work

conditions versus just specs on paper.

So for anyone who’s used different types on big projects what actually works better for large

slab compaction in the field and why does it feel like every brand claims theirs is the perfect fit

but results still depend on the crew and timing in the end?