Another thing I will add is that I think you may be off when you list the shocks and suspension of the diamondback as a “pro” over the Jet.
If anything, the Jet frame has a slightly more redined suspension design, though in practice you are unlikely to notice much difference.
And as far as the fork and shocks go, the forks and rear shocks on those two bikes are very comparable in overall quality, and opinions will vary as to which are preferable.