What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
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.