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It depends, if you want the best possible colonoscopy quality, do the liquid/"sludge" prep, the general consensus is it cleans you out the best and gives the best possible view during the procedure. However that's only true if you actually do it properly and drink all the liquid.

A decent number of patients can't/don't get through all the liquid in which case the pills are far better.

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I’m doing it this year. Does the pill work as effectively as the drink?
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> Oral sodium sulfate in a single dose has been found to cause increased gastrointestinal (GI) events

> Sodium phosphate is no longer recommended as a bowel preparation regimen due to its serious side effects

Essentially, put in the effort and do the liquid bowel prep.

Consider adding flavour drops to your drink, icing it or turn it into a slushie to make it slightly more interesting to drink. The PEG will make the ice crystals slightly more smoother.

https://www.ncbi.nlm.nih.gov/books/NBK535368/

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> Sodium phosphate is no longer recommended as a bowel preparation regimen due to its serious side effects

Well in my country, it's still wildly used for people without renal issues.

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Some doctors will say yes, some no. Best bet is to do what your doctor suggests, but at least ask if the pills are an option.
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I can’t compare the two, but fwiw, in my experience, while the drink is mildly unpleasant it’s only the texture of the drink itself that’s bad and the fact that you have to drink quite a bit of it. It doesn’t taste bad per se (and you can add flavored drink mix to help) and the “purging” part is painless, ie no cramps or anything.
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