Ext4 for Linux and Fuse with OS X?

System: El-Capitan 10.11.5, Macbook Air 2013-Mid, SSD 128 GB. I would like do a new partition in my SSD. Install Ubuntu on it side-by-side with OS X. I have documents which I would like to use by both systems. Proposal 1 with SSD --- - OSX in OSX Extended. - Linux in ext4. - Use fuse if need files of Linux in OSX. Not sure how well this works. I am unsure how you can create a symlink from Linux-ext4 to OSX-extended through fuse. Proposal 2 with SSD + big HD in memory card slot --- - OS X in OSX Extended. - Linux in ext4. - Big HD in ntfs. Both systems should be able to read it. However, possible conflicts with Linux permissions. How well will symlinks work to 2nd HD from OSX and Linux? Can both systems use ntfs format? Is there any better format which both systems (Linux and OSX) can use? --- How can you initiate ext4 for OS X's Linux partition and use it with OS X?