I'm sure both work. Park was first, others may vary in design just to get around patents.

I have the Park, would not have bought at new price ($40 I think) but got for $5 in used bin at local bike shop. Whole kit but no solvent. I use tiki torch fuel (98% mineral oil with a bit of citronella to repel bugs) because mostly full big bottles are $2 at end of summer at goodwill, people dropping off so don't need to store over the winter. Excellent oil solvent, not volatile so not hazardous, needs a wick to burn like vegetable oil. Chain comes out clean. Slow evaporation of remaining on chain is not a problem in my bedroom.

Planning to go back to paraffin wax like my road bike days, never had to clean first, chain was always real clean, just starting to squeak, just place in melted wax, let sit awhile, remove and wipe off excess, be careful it's hot.