Magnum heads hands down.

1 Machined valve cover rails
2 10 Bolt valve covers
3 Way better chamber, works good with higher compression
4 Way better ex port (Except 308 head)
5 Better intake porty (not just flow either)
6 Smaller chamber, easier to build compression
7 No heat crossover
8 Vertical bolts easier to get to
9 lighter valve train needs less spring pressure
10 Hydraulic roller (except 89-92 360 and some 85-91 318)