Arguing is gay, bringing up ancient threads and arguing more is even more gay. Ls1 is better for DD, but less impressive if making equal power. Rotaries aren't God's gift to engines, but they're still pretty cool. If you're scared, put a Ls1 in it. If you do the research and work with people that know what they're doing, the rotary is nice. Use super seals and go easy on the timing.