When you do a lot of climbing and fast decent"s down uneven roads you can tell the difference in frames. I'm not going to say any are better or worse but I'll say what I've noticed riding my bikes. Firstly on the flats they all feel the same mostly.

My SL frame swings the BB when climbing, standing while climbing it swings alarmingly and flex's quite a lot on dips in the road decending (more than EL) but feeling nice.

My EL frame is stiff in the BB and climbs incredibly well climbing it feels like all my power is going to the ground. On decent's in dips in the road or G outs the frame triangle flexes but feels good to me.

My 531 is not great at anything and not bad at anything, it just works and is comfortable.

My Deda Zero frame for a steel frame feels the stiffest and harshest, I just don't notice any real flex but the fork does a great job of reducing road buzz.

I prefer riding riding the EL-OS frame. For me it just has a feeling that it's more special.