This is simply a matter of taste. There is any amount of money one can spend on Lookbook apps and while the free apps such as the Easy LookBook Creator offer perfectly fine functionality and customisation options you can see from their pricing page that the limitations of their most basic plan are plain to see:
In my experience, merchants have spoken very highly indeed of the Easy Galleries for Shopify app, which was developed by Shopify experts, Oscar & Alfie. Merchants have commended the app's excellent support channels, ease of installation and general use and aesthetically-pleasing end results!
Hope this helps!