Druckbecherpistole - better investment then Saugbecherpistole ?

Hi

I have few questions. Can I with Druckbecherpistole (eng. "Pressure feed") work with materials like Fertan and FluidFilm, because they are mainly used with Saugbecherpistolen (eng. "Siphon feed")? First I wass planning to order from KSD Saugbecherpistole for FluidFilm and FERTAN, but now I think that if I order Druckbecherpistole I will beable to use FluidFilm, FERTAN (with same, lower or higher quality than with Saugbecherpistole ?) and MS and FulidFilm NAS. Is that true or not ?
Will I make a mistake if I take cheap Vauple (85 E) instead of FERTAN (165 E)? Has anybody worked with Vaupel? Which types of DBP are you using ?

Thank you very much in advance

Best regards from Croatia,
Ivan

P.S. You can write your answer in german (I don't have any problem understanding it)