ARIMA gives Trend (or Regression) - can see its slope... 

LSTM gives MovingAverage - posessing curvature & slope in each moment - that can characterize also acceleration up or down

p.s.

in all times Lines in e.g. classical supply-demand charts in economics were considered to be **Static Models** (as all regressions), and Curves on such charts (instead of lines) reflects **Dynamic Models** (showing not only speed but also acceleration)