SCL and timers

Hi all, i am newbe in SCL
my question:
what better use in SCL S5 timers or SFB timers

and may i use timers in IF-ELSE structure, like this (i think its not good):

IF m0.0
THEN
BCD := S_ODT(T_NO:=T1,
S:= condition_1,
R:= condition_2,
TV:= T#60s,
Q:=M1.0);
END_IF;

I'd use the SFB timers as you don't need to keep track of timer numbers as you do when using the S5 timers.

I would also process the timers all the time.

tnx a lot.