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Hi Shan and welcome to IIS!
For visual observing, I highly recommend getting a dobsonian mount. It is the easiest and most intuitive mount for a reflector. You just point and observe! As Martin has said, f4 is a fast scope which will be more sensitive to precise collimation and will need a coma corrector for visual ( the faster the focal ratio the more coma you see)
There will be no difference visually between the f5 Sky Watcher Classic and Black Diamond as they are the same focal ratio. Good luck on your visual journey and feel free to ask as many questions as you like!
Cheers
Joe
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