apm vs. acpi

[Amy M]

All things considered, this fedora-list has become perhaps one of the 
best forums to learn Linux.  Our sincere thanks to those who are 
gracious enough to donate their time answering questions that sometimes 
may seem ridiculous.

My question now is: From what I have read, it appears that if I want to 
do suspend to ram, I have to forgo acpi and use apm.  Performance-wise, 
would anyone care to comment on the pros and cons of acpi vis-a-vis 
apm?  Thanks again.