Hi,
I fully agree with Matias and advise to develop both.
While performing I usualy use sheet-music with only melody-lines and chords. In fact I could play without, but I feel 'stronger' with the sheets in front of me. Details in chord-usage probably would disappear without the sheets and it is easy to lose the 'track'.
Professional Show Bands in The Netherlands all want musicians that are able to play without sheets and no mistakes are allowed.

Roel