Buy Huawei Mate 10 Pro or wait

Hi! As I'm currently using the Huawei P9 for around a year+ and it's starting to lag alot so I was thinking of changing to the Huawei Mate 10 Pro but the Samsung S9/S9+ will be out in around 2 months so I was thinking of waiting for it as well.
Based on the rumors and leaks of the S9+ do you think its worth to wait for it or just get the Mate 10 Pro? Thanks!

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