I've had a 5" mak and currently have 8" and 10" SCT. I compared the mak to my 5" acro refractor some time ago and they both saw about the same level of detail at the same magnification. The mak may have had the edge but it was close. I must say that the mak was syperb but heavy. No focus shift and sharp and took magnification well.
There is no comparision of 5" mak to 8" SCT. The 8" will beat it every time. Just like a 10" will beat an 8" every time.
With a metro backyard you will be combating light polution, so I would again recommend the 8"
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