Relative to ELS just depends upon your time period! SUI has done similarly, or better than ELS for the periods of 5 years or less based on yahoo charts. Stock price, not operations, or div increases or such.
There are many things to like about SUI, but at present prices I do not expect significant, or any, capital gains. (I may get some - those prices in the mid 50s were an absolute gift given the current dividend - but what I currently hold is not for that purpose. I did however, buy SUI for capital gains at much lower prices.) SUI was within spitting distance of this price 10+ years ago. SUI has not raised its dividend since early 2005. What does the future hold?
A catalyst is improving the performance of the acquired properties, given SUI has been on a huge acquisition binge and also deleveraged some. Stay tuned and keep an eye on the quarterlies.
SUI-A is not bad at present prices. dar has enumerated the problems with pfds, and they are real, so you have to be careful.