ENS is a better visa for the employee as it doesn't have the cancellation provisions that RSMS has.
But the RSMS cancellation provisions are not as much of a problem as they look. It's still a permanent visa. As long as you make a genuine effort to stay with your employer for 2 years you are ok. If you're laid off, for example, you are a free agent and can live anywhere in Australia. Same applies after you've done the 2 years.
RSMS is usually easier to obtain than ENS, but there are exceptions to the rule.
Correct. Work for them for 20 years on a 457, and as soon as they don't need you it's back home.
You've found one employer from overseas that was keen to hire you, maybe it's time to see if you can find another one. Especially if you haven't yet resigned from your job in the UK.
Of course, if you turn around and tell your existing prospective employer the answer is a NO as they won't sponsor for PR, then their view might change but don't count on it.
Jeremy
help urgent Sender: welshtonyEligibilty for migration depends on many circumstances that are not given in your post, not least, For skills visas, being under 45 and...
-- This is not intended to be legal or professional advice in any jurisdiction