Let's see...
Sloane:
- encourages her cronies to bully poor people
- sentences people to exile/death for being poor, of course after beating them hard first
- is a drug lord
- arbitrarily makes decisions on public executions just to entertain mob
- seriously fails to protect people from Ketts, and requires the fact to be kept in secret
- falls for the most basic and obvious trick disregarding years of training and experience
- offends Ryder numerous times, and then jumps to conclusion that Ryder is going to help her... over and over again
- ...and then requires the Initiative to *pay her* for nothing (or actually for granting Sloane even more favors)
- deeply hates the Initiative and wishes it ill.
Reyes:
- encourages trade and cooperation (even if only in public)
- protects people, e.g. from Roakars...
- ...and does not even ask to be acknowledged for it
- allows legal government to prevail (even if only in public)
- remains gentle and respectful to Ryder and the Initiative
- remains on good terms with Angara
- seems to be gentle and respectful to others (at least in public), excluding some of his bitter foes
- is successful in almost everything he does
- always pays his dues
- usually defeats own foes (such as Sloane) without jeopardizing others and avoiding excessive bloodshed if possible
- is *able* to forgive some of his foes (such as Kaetus)
- supports Initiative.
As for the "duel" thing... Seriously, I do believe that this is one of the *worst* examples of writing in the game. Let's be serious: Sloane is on Reyes mercy by entering the cave. Reyes has absolutely no reason to speak with Sloane, to offer the duel, etc. The sniper is already there and waiting, and Sloane has no way to protect herself. The only reason why Reyes offers the "duel" is to mock Sloane - which I guess is a personal issue. I do not like it, I do find it repelling that he plays Sloane like this, but I still find the very *idea* of his trap to be smart and valid. And actually mocking Sloane is quite *similar* to beating all those paupers by Outcasts prior to throwing them out from Kadara Port. So yes, I find what Reyes does to Sloane to be a kind of poetic justice - even though I would prefer him not to do this.
...and even so what Reyes does to Sloane is much less repelling than what Sloane does to others *all the time*. :-(