Now that we have mercs.....

I know exp per kill is best solo, but is it better to have merc around and kill faster/easier ----> better xp?
I am asking this because I can solo in DSK for good exp, but it is rather challenging without a merc. With a merc cleric healing me, it is cake but less exp per kill.
So what do you think is best? Soloing without merc but having that added risk of getting killed and having to med every now and then or pop cleric merc and keep going with little risk and no real med breaks (cleric merc works so freaking well)?
I am asking this because I can solo in DSK for good exp, but it is rather challenging without a merc. With a merc cleric healing me, it is cake but less exp per kill.
So what do you think is best? Soloing without merc but having that added risk of getting killed and having to med every now and then or pop cleric merc and keep going with little risk and no real med breaks (cleric merc works so freaking well)?