non-journaled filesystems on liveusb media

[daemonfowl]

Hi everyone !!!

A question :
Some would argue that on usbs , the best filesystem to use is non-journaled .. fat32 or ext2 .. as less writing is imposed on the usb fragile sectors .. then this would extend the life of the medium ..

* is this true ?
* are there any security-risk consequences ?

maybe this third question is off-topic ,

* slax can be installed on usbs using either linux filesystems or fat32 ..
can I install *BSD on a fat32 formatted usb ?
maybe to let it be accessible as thumb drive when used elsewhere unix machines .. for instance ..
* in this case .. is there a way to secure access to it ?

Million Thanks to everyone sharing knowledge ..