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If you can run Mavericks, I would say "no". As far as I'm concerned, there is nothing better in Lion over Mavericks.
 
There is pretty much no reason to use it if your system supports Mavericks.

Mavericks is a refined Mountain Lion and Mountain Lion is a refined Lion.
 
If Snow Leopard still had security upgrades and I was not forced to move beyond because of some application, I would keep that.

Otherwise, go for Mountain Lion if you can avoid Mavericks.
 
If Snow Leopard still had security upgrades and I was not forced to move beyond because of some application, I would keep that.

I still use Snow Leopard, as do thousands of other users. I haven't read any accounts of massive security issues, and have had none myself.
 
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