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What do you mean by "better"?

Did you mean faster or higher chances to be accepted?

I don't think that it'll change much... for both.

I believe that the only difference is that for paper based you should wait for papers to arrive...
But apart from that... it is probably the same.
 
I think its pretty much same.

If you will search on this forum some people get visa within couple of weeks regardless of online/paper-based. For others, it may take 5,6 or even 7 to 10 months regardless of online/paper-based.

I prefer online because its easy/convenient to submit, fill the application and upload the required documents.
 
how to upoload supporting documents such as diploma, transcript, IELTS, birth certificate and etc? There not according upload section for these docs. Should it be uploaded together with explanation letter?
 
If you are from Pakistan I would recommend paper application as I have seen paper applications being processed faster than online