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You are asking which is better between dropbox or google spreadsheets.
I am sorry to say but this is theoretically a very opinionated topic as some would say google is better and others would argue dropbox. So there's really no right answer for this other than preference.
Personally, I prefer google overall but again that is my opinion based on past experiences.
The actual result between Google and Dropbox is that the file output's for what you have mentioned above are actually both different. Dropbox would receive your submission data as a PDF whereas Google Spreadsheet would be a spreadsheet similar to excel instead.