Trading only: if you intend to trade only futures and options
Trading and demat: Along with the above you also want to do equity delivery based/intraday trades.
Trading + Demat+ commodity: Along with the above you also want to trade commodities.
Trading only : will allow me trade intraday equity whithout having DEMAt Account ?
Nope, you have to open the 2nd A/c i.e Trading and Demat if you want to do Buy/sell FnO and Equity