confuse confuse .....

on Mon, i check with TC-Lokyang, SA say possible to change a stiffer spring (as latio sports) upon assessment .....
today, i passby and walk-in to TC-Toapayoh, after assessment SA say my ride is 2006 (old spring) and OK to change to improved spring (same as in current new latio sedan) and that latio-sport's spring cant fit into sedan's .......
anyway, aldy make appt to had it replaced at TC-toapayoh this Fri "with improved spring on new sedan" .... need half day to replaced ......
Questions:
1. is current new lation facing same problem ?
2. better for me to insist of changing to sport's spring ?
3. is sport's spring really better or just sane sh*t ?
sianz .......