Bottom one is a XLS if i remember correctly, although it was over 20 years ago....
In fact looking at the shape of the chassis, I recon both the cars are XLS's just don't know what the red body is....
If I am wrong please don't shout at me
guessing it would depend on if you can get them running, and the diffs, belts are in good nick... a running car is allways worth more than a unknown car... but someone eles will advise... at least you know what to look up on ebay now...
this one went for just over £100, but looked in reasonable condition...
http://www.ebay.co.uk/itm/Vintage-Sc...item4cfa66325f