Hi roobarb4411
You receive Class 1 National Insurance credits with your New Style ESA claim and these go towards future Benefits claims and the State Pension. But with UC you only get class 3 National Insurance credits that don't count towards any future Benefits claim.
But if you do close your NS ESA claim then it won't lower your Transitional Protection.
David
Nothing on this board constitutes legal advice - always consult a professional about specific problems