1) I assume you live in NJ and have a high income as these are municipal bonds.

2)EVJ invests in investment grade while MUJ invests in insured bonds. They seem safe enough.

3)EVJ has an expense ration of 1.95% while MUJ has an ER of 1.18%.
Both are high numbers in my opinion. Check vanguard for low cost mutual funds.

4)Both funds trade at a discount to NAV which allows you to buy the assets at less than market value, this may offset the high ER.

5) I do not have the time but you should determine if the funds borrow money to boost their returns. This may explain why the ER's are so high. It will also increase price volitility without necessarily improving the yield.

6) Both companies meet the minimun standards of being reputable.

7) If you are paying a full service fee for this advice ask the broker if he/she can send you a recent copy of an service they subscribe to that rates CEFs, then you can compare these two to the 100 or so others.