Haweses are cheaper, but don't cheap out on you hawse.
There are some cheap options out there that are basically nothing more than a plate with a groove.
The edges of the opening/groove should have a generous radius (at least 1.5x line radius i believe)
It is true that rollers are not recommended for synthetic line due to the chance that the line could be drawn into the gap between the vertical and horizontal rollers and sliced. Though synthetic is strong as hell under tensile loading, it can be cut easily.
That said, I had a conversation with Jonathan Hanson about this, and he was of the opinion that rollers are BETTER for synthetic. Rollers have less friction and therefor less heat, which synth likes. And he says he has done experiments trying to jam the role between the rollers and has been unable to induce the condition.
Whether you go hawse or roller, if you go synthetic, make sure your drum has been smoothed and is free of burs.