Leinster have advantages in four areas
1. the coach, Tandy has been a pleasant surprise as a coach, seems to have got the players playing a lot smarter rugby compared to the latter stages of Johnson/Holley, with the exception of a poor game against Aironi, the Ospreys have been playing more fluently and with a better game plan, but Joe Schmidt in my opinion is possibly the best coach in the world, he has pretty much the same squad as Cheika yet Leinster look a much better side with Schmidt
2. the backs, the Ospreys have a few backs on good form, but the quality in the Leinster backs is higher
3. the bench, Leinster have several internationals on the bench who can make an impact and change the game, the Ospreys have several inexperienced players
4. home advantage, obviously
the Ospreys meanwhile only real advantage is the pack, so that will decide how close the Ospreys get
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I have said Healy improved and is a good player, but he isn't as good a scrummager as Paul James, but has a more all around game
I think Bevington is very good, rather than Healy is bad, there's not much between them apart from experience, Bevington should become a better player when he gets the experience
also in regards to that Ospreys Leinster match, Leinster were doing well with White on, the Ospreys got on top with Hagan on, and then pummelled the scrum with McGrath on
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Healy does decently normally against most props, but the top operators can still get on top of him, and the Ospreys have one of best in the world