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It really depends on the quality of signal where you are at the time rather than the hardware itself.
My 4g router gives me 200Mbps upload on a good day but might only be able to do 50 Mbps 200m away.
The best thing to do would be to order some free payg sims from the usual phone providers and do some speed tests with your phone to see which performs best. You could then get a dongle for that network.
Any recommendation for any PAYG or no contract required dongle that has amazing upload speed? Need to do just a one of task for work that most requires uploading a lot of images etc. I am not going to pay for a more expensive internet plan as it can do everything I need except uploading loads of stuff at once.
Obviously work is paying for it.