The first effect is the strongest because it's the same as skipping your opponent's next draw phase, the second is just a plus.
It's difficult to trigger a flip effect in the current meta but if you do it you gain a good advantage.
Perfect Card for Exodia
First summon it to send an exodia piece to graveyard, next destroy it with one of your own trap/spell cards, to draw another card. Balista Squad which forces you to destroy 1 monster on each side as an example. So it's an offensive move with Drawing Potential.
technically, half-right. A. Onslaught cannot be activated. Negate is usually you can still activate the card but 0 resolve after activation but in this case, not.