Both Minolta and Nikon make excellent cameras. Nikon has a larger choice in lenses available themselves, which may be good.
Lenses for Minolta MD mount are getting hard to get. There are few new ones and happy users tend to hang onto their old ones (I know I do
Both old Minoltas and old Nikons are turning up regularly at camera collectors events for near newprice (this for 20 year old cameras).
Lately, Minolta is reported to be having some problems with the reliability of their electronics, causing sudden failures which are hard to fix.