I think that you are going to get the same answer:
You have already been accepted to two excellent universities with very strong CS programs, one of which comes with a full ride. Your chances of being accepted to UC Berkeley as an undergraduate student appear to be bleak (whether on appeal or as a transfer student). While UC Berkeley is excellent for CS, it is not enough better than UF or Purdue to be worth the full out of state cost unless your parents are very, very wealthy.
You can certainly appeal to UC Berkeley and then apply to transfer. No one here is going to stop you. Do not expect either to succeed.
Also, if you are looking to apply to a graduate program in the future, and assuming good results as an undergraduate student plus good work experience and related strong references, your chances of getting accepted for a master’s degree will be significantly better compared to transferring into UCB as an undergraduate student. It is very normal and generally encouraged for students who go on to graduate school to do so at a different university compared to where they got their master’s degree.
I would like to add however that you really have been accepted to two great schools, and you must have done something very well to have earned these two great acceptances and the great scholarship to UF. CONGRATULATIONS!
You should be very proud of what you have already accomplished.
Also, when you arrive at UF or Purdue in September, make sure to attend every class, always pay attention, and make a strong effort to stay well ahead in your work. As one example there will be times when your software has a bug that takes way more time than it seems like it should, and you want to be ahead in your work so that you have time to find the bug and fix it. Also, the opportunity that you have earned to get a bachelor’s at either UF or Purdue is going to help to set you up to do well in life. If you want it will also help you get the chance to attend a strong graduate program whenever and wherever you want to do this.
You have earned a great opportunity at your choice of UF and Purdue and you should take full advantage.