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dangeek
There's others here with better knowledge of the sort of MTB you're looking for so I won't recommend anything specific in terms of a bike.
But I will say that generally 29ers have certain inherent advantages over 27.5 that might be useful to you, chiefly the gyroscopic effect that helps maintain momentum when up to speed. They also aid traction and grip better than smaller wheels. Downsides to 29ers are weight (heavier than 27.5) and handling that can be cumbersome if the bike's geo isn't optimised for the bigger wheels.
You could also consider 27.5+, a 27.5 wheel that has a tyre size on the range of 2.6" + 3". In 2.8" to 3" size the total diameter of the wheel is virtually the same as a 29er so has similar properties, but with the added benefit of more rubber for extra pneumatic suspension as well as the opportunity to run lower pressures than the 29er to get more grip when you need it.
There's many hardtails available now that can take both 29" and 27.5"+ wheels so you could have two wheelsets for different types of riding.