If Zippy had a larger file limit, that would be my goto, always get very consistent speeds from there, otherwise I tend to go for the workupload, which is a bit worse for speeds, but it tends to work fairly well
MEGA is an absolute nightmare as you are forced to either use their software (which is a massive pain to use) or do browser downloading, which is always hit and miss as I've had multiple occasions where hitting "save" does nothing for some reason after the download, nevermind the stupid transfer limit....