No difference as mentioned by others, BR change accordingly, adding back ur spread, u get a same rate. Just do a research on which bank does quick adjustment, which banks delay or does not.

For lowering wise, of coz the bank that act fast will benefits u as ur rates adjust quickly; vice versa; when OPR rise, bank that act slow benefits u as u enjoy 'lower' rate for longer period

From what I know, there are banks that did not fully follow the drop of 1.25% OPR/BR since early this year