I've had great experiences with both, but so far I've met more inspiring SLIs than LSEs.
My preferences in music, movies, hobbies, politics and lifestyle in general are somewhat undergroud, and most LSEs I know are very "mainstream" people. They wear whatever the local H&M sells, listen to whatever's on the radio, watch stupid reality TV shows and, worst of all, show absolutely no interest and/or skill in analytical/philosophical discussions. I also often feel ashamed about their sense of humour..
My Te-LSE granpa may be to blame for this; he obviously thought he was a real charm, while he was usually just acting like a social retard. Even at the age of 6 I was constantly facepalming in his company. No discretion whatsoever.
SLIs, on the other hand, are more wary and know when to shut their mouths. I've considered I might actually be IEE because of this, but IJ temperament and Se polr make much much more sense than EP & Ti-polr.
The communication with LSEs is of course really easy and I find the EJ temperament pleasant, but as individuals I too often feel we have not much to offer to each other..