What's safer with less side effects suprep or golytely (polyethylene glycol) in my opinion golytely (polyethylene glycol) is but requires a lot more of liquids vs suprep with worse side effects?

Equal. If taken properly they are equally safe. Suprep is easier to take because the volume is less. Given the large volume required for Golytely (polyethylene glycol) I rarely recommend it, except in hospitalized patients since it is more available. Both should be taken in split doses, both the evening before and about 4 hrs before the procedure for best results.