I've always had good luck with 3rd party batteries but when I got the 5diii and read some of the tales of woe, I decided to go with OEM replacement batteries. After what that camera costs, it did not make sense to get a battery for $20 less and then have issues.
Now, with my M, I faced the same dilemma. After considering, I got an OEM as my "extra battery" since, at this point, I won't have the camera away form a charger for more than a day and 2 batteries ought to be plenty. If I take this on a trek where I'd be away from electricity for days, I might have to consider the options, again.