I haven't done a direct comparison on the same vehicle but I've used both. Megs 151 seems like a great one step so far but I've only used it once so I can't speak to durability. 151 has quite a bit more cut than Poli-Seal and has more of a sealant look versus the 'nuba look Poli-Seal has. I would think both have their place to be honest. If a vehicle has soft paint and/or only slight swirling I would go for Poli-Seal over 151 since 151 supposedly has more cut than #83.