Hi Peter,
A premium 14" to 16" Newtonian will give superior planetary views to your 10" Skywatcher, when thermal and seeing conditions are favourable.
With a mass produced 14" to 14" dob the optical quality will vary. One of the guys who goes to the Pony Club, has or had, a 14" Skywatcher that give exceptional lunar planetary views. Unfortunately most mass produced mirrors won't be at that level.
Cheers
John B
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