I think you should also be concerned about the track record of these brokers. Vault Markets customer support is poor and from my experience withdrawals can be difficult. Don't be swayed by the bonuses offered by vault markets because in many cases the conditions for withdrawing profits realized from these bonuses can be unrealistic and tiring.
Ifx brokers is better for a micro account or any account at all because they have better customer support with live chat (access the live chat from your personal area) and there is no minimum deposit required for opening a micro account.