In the following posting (and in its thread) it just has been proven that Cash Account is almost 5x better than Margin Account, regarding profitability, especially when trading Option Spreads, in that example using Vertical Put Spread (ie. ShortPut + LongPut):
https://www.elitetrader.com/et/thre...ertical-put-spread.369011/page-3#post-5654948
https://www.elitetrader.com/et/thre...ertical-put-spread.369011/page-3#post-5654948