1-NT Brokerage is just an IB, not a broker. They have partner brokers that are allowed to use NT. They have direct relationship with 2 futures brokers. See website. No opinion about which is better.
We offer $500 daytrading margins and match or beat commissions...Low day trading margins are not my personal favorite, I think a trader should impose on him/her self $400 per ES even for daytrading.