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I've had a couple of pairs of Nike peg trails and really like them wet grip is good but tarmac wears the tread on them really quickly so unless your doing a lot of mixed surface runs you'll probably be better with a grippy road shoe. Like tyres compound is more important for grip than tread. My mud claws were great in deep mud but awful on tarmac especially in the wet. Adidas do some models with Continental rubber which doesn't look like much but is very grippy and I didn't notice any excess wear on mine. Bostons are always solid and the new Adizero Adios pros are great. I'd also avoid anything with the current trend of mega high stack and bounce they're great in straight lines but not fun cornering especially in the wet.
I'd like to get a pair of running shoes specifically for rainy days to give me a better grip on wet tarmac. Where should I be looking? The various Nike Trail models are marketed towards off piste runs, but so far these appear to be closest fit to my need.