None of them are good but you know when you have some kinds of BACK, when you have buddies in the forum, you are likely to get away by doing the same while others without buddies have to cost their reputation. Surprisingly, some of the respected members of the forum have totally different views on different casino.
What I have learnt is- If casino bans account for multi accounting, it's fine as long as the casino is X and if casino bans account for multi accounting, it's not fine if they are not the casino X. In that case, you have to show solid proof of multi accounting.