SE will look a bit more company car in terms of body style but it'll have softer suspension, smaller wheels, and bigger tyres, so it'll be a bit "waftier". Comfort and ride quality are prioritised.
M Sport will have a bit more aggressive body style (different bumpers and side skirts), bigger wheels, lower profile tyres, and depending on what's been optioned when new, it might sit slightly lower (maybe 10mm). Sporty look and feel is prioritised.
Handy tips for BMWs:
SE will look a bit more company car in terms of body style but it'll have softer suspension, smaller wheels, and bigger tyres, so it'll be a bit "waftier". Comfort and ride quality are prioritised.
M Sport will have a bit more aggressive body style (different bumpers and side skirts), bigger wheels, lower profile tyres, and depending on what's been optioned when new, it might sit slightly lower (maybe 10mm). Sporty look and feel is prioritised.