It's interesting, the difference between mirrors. SLEs are very impulsive, yet they wade through their impulsiveness within improvisational logical frameworks. This tends to lend them short term success, because their recklessness is tempered by what I would call acceptable reason, a kind of disposable set of rules and justifications that aids them in the imposition of their Se agenda. I envy them this ability, but I think they often (not always) pay for this in the long run by not considering the social ramifications of their behavior. They start making enemies and eventually something career-ending or job-ending happens to them and they and their family are left disgraced. To the SLE, power and prestige, to varying degrees, of course, are themselves the goal, and the implementation, the Ti, is merely the tool.
LSIs are much more subdued and socially proper in their approach. They tend not to actively push social boundaries the way that SLEs do. Instead, they pursue the implementation/maintenance of their subjective, systematic concept of reality, then rigidly yet gradually impose this framework onto society. The gradual nature of this approach means that LSIs are less likely than SLEs to attain short term "victories," which SLEs flaunt flamboyantly in an effort to win over the opposite sex. However, I think the gradual, socially conscientious approach to goal implementation by the LSI means that they will often (not always) more reliably acquire power, albeit at the expense of short term gains. For instance, people will laugh at the LSI at first, for being too boring, too traditional in their approach. But ten, twenty, thirty years later, the LSI, seemingly out of nowhere is the one who has the power. The LSI's downfall is that they will often act impulsively and recklessly when they perceive an opportunity to acquire power (and thus the ability to further implement their world view). For instance, an LSI may stage a coup and then be killed himself when one of his allies unexpectedly betrays him.
I know this is all Socionics 101, but I felt like writing about it.