Pros and cons of installing ESXi on a SSD vs USB flash drive?

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http://serverfault.com – I'm debating on doing an ESXi 4.1/5.0 installation on a USB stick or a pair of 32GB SATA II SSDs (RAID1 mirror). According to VMWare's documentation, when ESXi is booting it looks for a 4GB space for a scratch partition. Assuming the USB stick I use has adequate storage (say 16GB), is there any advantage to installing ESXi on an SSD or better yet, and SSD RAID1 mirror? Note: The documentation states that ESXi takes up 5.2GB of free space on disk; 5.2GB + 4GB = 9.2GB which is well below the 16GB for the USB stick. I'd prefer to use the SSDs for something other than the ESXi installation. I thi (HowTos)