It´s a double YES!
1st of all, MBB is much better than BIG4 Consulting in multiple KPIs (salary, prestige, aluni network, exit opportunities, etc.)
2nd, Singapore it´s a dream location -if you have availability of course, and don´t have any ties to other places such as family-. Taxes are much lower than in London, so your neto will be very generous.
Hope this helps!