Choosing between a Kaweko Sport or TWSBI Eco

I'm pretty new to fountain pens, currently I just own a fine nib Pilot Kakuno. I only really use my pen for journalling at the moment and some drawing. I've been interested in piston-fill pens but I've heard a lot about TWSBI pens cracking and where I am, a TWSBI Eco would cost upwards of $50 CAD, while the kaweko sport is less expensive but I'd need to get a convertor.

I'm a student so I'd prefer a pen that can handle being carried around and not always kept at home in a pen case, but I don't know how the writing experience with the Kaweko Sport would compare with TWSBI.