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Usually watches at this level and price point use miyota (owned by citizen watch co) 82xx series or Seiko nh branded movements. You'd be hard pressed to tell the difference between the two from a user/wearer standpoint when comparable movements from each brand are put head to head. If we're talking about one of miyota's slightly higher end 90xx series movts (like a 9015) then you'd have to compare something like seiko's nh movement equivalent to a 6r15 (I believe its ne15a) which is found in watches like the sumo, however in this case you would notice a difference between them since the miyota movts in this range have a higher bph and as a result of this, have a much smoother seconds hand. Again, quality wise they're both great and in my opinion unless you're a collector, you're not going to notice or be affected by choosing one movement over the other.
To throw in my two cents, my experience with Seiko movements has shown them to be slightly more accurate than miyota. However every batch of movements can deviate from the previous batches so I'm sure there are other collectors out there with the opposite experience. Seiko just seems to do a better job regulating them before they leave the factory. At the end of the day we're talking + or - a few seconds every 24 hours so the average watch wearer would think I'm crazy for even noticing.
Cheers