What is the difference between Browse Data For All Revisions on S3 ,Raw data on AWS,Curated dataset and Processed data for Subject 1 on AWS for each subject?
Browse Data For All Revisions on S3 leads you to a browser where you should be able to find the other three versions of the dataset you mention (Raw data on AWS, Curated dataset and Processed data).
Which dataset should I download?
It seems that there are two revisions of this dataset. The first one (R1.0.0) is not in BIDS. The second (R2.0.0) is in BIDS but the EEG is not included. Since you want to have EEG, you should get all subjects from: https://openfmri.org/s3-browser/?prefix=ds000116/ds000116_R1.0.0/compressed/, which contains the compressed files corresponding to the revision 1.0.0.
Is the dataset Processed data for Subject 1 on AWS for each subject, is pre-processed, if yes then what pre-processing steps have been done?
All those links with preprocessed data contain the raw and preprocessed data as they were uploaded by the original submitter and briefly described in the README file https://openfmri.org/media/ds000116/README_8e6eXke.txt
can someone point me to resources for pre-processing EEG and fMRI data, can I use fmriprep for fMRI data?
fmriprep is definitely an option. I would first check on https://openneuro.org for this dataset to be preprocessed with fmriprep. I’ll repost here if I find it. If you are to run fmriprep yourself, then I’d recommend downloading the version R2.0.0 because R1.0.0 is not in BIDS format (and fmriprep will not accept that).
You could extract the EEG information from R1.0.0 and add it once you have the fMRI data pre-processed.