So allow me to first repeat what I've said on FR dozens of times: When we evaluate candidates, we should consider their...
* voting record,
* present position statements & rampant inconsistency of past position statements,
* social issues' stances,
* character, including spiritual discernment (for example, does he/she at least pray to THE true God?),
* viability,
* scandal-free past,
* worldviews/beliefs -- including other-worldly worldviews, etc.
So, as to your question, I don't know ANYTHING about the Jewish candidate.
Also, I have a few recollections from that previous Heller research -- but because they are not right at my disposal, they are a bit vague:
#1 My understanding back then was that he didn't necessarily have fully "fleshed out" Mormon credentials...at that time, anyway...for example, it's possible that he was -- as of that time -- not a "temple" Mormon...Non-temple Mormons don't necessarily make themselves out to be "gods-in-embryo"...
#2 The other recollection I had didn't have ANYTHING to do with his Mormonism...Since I don't have specific quotes from Nevada people who were sizing up Heller right in front of me, I hesitate sharing anything...other than their political opinion of Heller was not flattering.
So, bottom line...probably by typical Nevada candidate standards...it's possible that Heller is "above average."
As far as a voter recommend, all I can say is that if both have favored abortion in any way, I wouldn't vote for either of them.
More recently, Heller has claimed to have evolved to become pro-life.