Anyone who has worked for both these firms (or some other comparable combination) will be able to tell you that in most cases the strategy firms are a short term gig for MOST people (very few can handle the pace), while the big 4 (of which Deloitte is by far the best firm) offer a more manageable work/life balance, resulting in people staying on much longer and (in my opinion) gaining a more rounded consulting profile (wider industry exposure, greater client interaction).The ongoing commoditisation of the consulting market is slowly-but-surely breaking the stranglehold that the strategy firms have on the top-end consulting market (just like some of the smaller technology consultancies are eating the lunch of the big 4), and so I would not automatically assume that you will gain better exposure at LEK, which leads me to my final point: In many cases, clients will have absolutely no idea who/what LEK is, while everyone knows Deloitte and what the firm stands for. So, if you want to move (or move back to) from consulting into industry (and believe me, the time will come), I'm not so sure that LEK will be the best bet.