I have carried several Parker pens that have simply stopped working, and somehow decide to 'eat' then cartridge. Even after several attempts with parker cartridges which all broke. Three 'click' ballpoints that stopped functioning, and two 'twist' pens that would not twist back after 1 month of use, instead twisted the ink cartridges apart.
I like the appeal of a fountain, but since I carry my pens in my pocket the majority of times I think I would prefer a ballpoint. I am strongly considering getting some replacement cartridges for my cross century pen if I can find it again as it is a great performing pen despite the thin profile.
If you are having trouble with the pens not writing (eating cartridges?) that is not a pen problem, that is a cartridge problem. I am not suprised that you have had bad luck with twist mechanisms as they are less durable than the click technology (the shell part can come apart from the inner/business part of the pen).
If you are breaking the click part of a modern metal Parker pen, then you are so rough on pens that I would be very reticent recommending a fountain pen to you.