as recap episodes to season 2 they are ok. if you personally don't have that much interest in the season, you can watch those instead, but for a generally better experience, I would prefer the actual season. Especially an anime like 86, where the quieter and more atmospheric moments allow the story to unfold, will not be fully utilised by a recap that will only contain action and essentials. Those who may have paused the anime for a long time could watch it to get a quick overview. However, 86 is so short that I doubt you would even pause the anime for a longerperiod of time.