Diesel Ryder is going to be a heavier, more narcotic hit. Also supposed to be a bit larger between the two.
It's not a completely heavy knock-out (for me) like a pure indica; there's a trippy aspect about it that's a lotta fun (sativa).
Ordinary NYC Diesel is pretty much crippler weed when I've smoked it...really good time IMO.
The Lowryder 2 would be a great parent strain if you wanted to give breeding a shot.
The Lowryder 2 also is supposed to have an added boost in weight and potency over the original Lowryder, while still finishing in 9 weeks.
G'luck and look forward to seeing your grow, which ever you choose!