Firstly, a big hello to you all. I only joined this august community about, ooo, 5 minutes ago. So, I'm diving head-first with my first message.
Electrostatic vs Dynamics is surely a choice between priorities and, even then, it's not a simple choice because external factors play a significant part.
To give a simplistic answer applied in a vacuum, electrostatics reign over midrange/treble performance while dynamics offer superior bass. I use a Stax 007 with a matched valve head amp but also a pair of Sennheiser HD650s but have auditioned other bass crunching heavies such as the Denon AH-D7000. The Senns and Denons provide natural bass power, the Stax set offers sublime detail and nuance.
But...but...I don't think the choice is that simple. Firstly, because the 007 is lucky to offer a matched head amp and you have to hunt for something similar for the dynamics. Next, I think the 007s have more bass potential than many people believe and I'll give you 2 reasons. I changed the power cable on the Stax head amp for a Van den Huul example which increased overall bass power and tightened up the lower bass. Later, I plugged it into a Isotek Aquarius conditioner which removed distortion and effected more powerful, lower bass, further tightening up the upper bass and, becasue the mids offered more clarity and detail, bass now has a better 'slam'. Hence, the argument cannot be limited to just the cans themselves.
Anyway, lovely to be here - I'm from the UK, btw.