I have the SkyWatcher Esprit 120 and can't fault it. With the field flattener, it has beautifully round stars right to the corners, so I would presume the 100 would be the same. Haven't used the Askar telescopes so can't comment on those I'm afraid.
Thanks for the advice everyone - I decided to try out a 150/750 Newt. I want to try out Newtonians before I commit to a premium refractor. I'm excited to be done with CA.
Cheers!
Though others may ague the toss, for we mere mortals the best value and highest astrophotography outcome is delivered via a quality triplet.
People with far greater expertise may disagree but a triplet is KISS, keeping it simple.