Let's not forget Paschal Donohoe. I like the cut of his jib.
An idle thought... who was the last Taoiseach who didn't leave office in disgrace?
John Bruton? If he had had more interest in the North he would have won re-election handy enough.
Politics is a bitch of a job, you can either try and do things your way and meet massive resistance (Reynolds), or just go in, and be a steady as she goes type of leader (Ahern, Kenny). Ultimately the job is about finding the right balance between various interest groups to ensure you don't lose your seat. The problem with most political systems is that they're essentially configured to resist change.
Both candidates would be superior to Kenny. Kenny's problem was not having any clear vision, and lacking any real intellect. While FF & FG were always fairly close policy wise, the distinction between them all but vanished under Enda.
Coveney is the safe boring choice, he will continue to operate FG as Kenny did, and won't make any real changes. FG would suffer badly at the next election if he stays.
Varadkar is the interesting choice. He does have the ability to speak without resorting to soundbites, and he does appear to have a vision for the country. He oversaw the department of Health without any major scandals or incidents, so he does strike me as the kind of guy that will appeal to the wider electorate who want something different to the usual politicians we have in the country. He speaks his mind and isn't afraid to call it as he sees it which is refreshing.
I would have backed FitzGerald, but she's damaged over the McCabe incident.