GS108 vs GS308 unmanages switches

Question:  What are any significant differences between the GS108 and GS308 ?  

I want to buy an unmanaged gigabit switch, I am in the UK

I have searched various sites and seen statements such as:

- only the warranty is different

- GS108 has better build quality (metal case)

- one site says GS108 has "passive cooling"  and GS308 has no cooling.

-finally, one site says GS308 is the big brother and says it has "auto negotiation function"  , no block switching architecture"  and "auto MDI/MDIX functions"   without saying if these are not features of the GS108. 

(of course, if I do not know what a feature is, perhaps it could be argued that I do not need it - I just want a fast, reliable, straightforward switch that will be used for streaming data, remote log-ins and regular internet traffic for email etc.

I see both switches currently available on AmazonUK, both with metal case and PRosafe warranty.

Any straightforward advice/answswers welcome.  Thanks.