With anything, you've got to make them struggle to get it. A mate had a LWB Transit where he used to be a mobile mechanic, compressor, Snap On tool boxes filled with practically a garage full of tools (specialized tools he had in a lock up) nicked when he was test driving a customers car - few hours later the van appears after being gutted. The garages I've got are all alarmed with CCTV - it wont stop them, just would help trying to deter them.

In regards to tools, I've got a range from Snap On, Mac, Blue Point, SP, Halfords Draper, Britool, Sealey etc etc etc (a lot of older stuff)... I struggle to find anything that beats Snap On although saying that, I have found some of the things such as torx and ratchet mechanisms getting slightly weaker over the years - think thats with everything though. The newer halfords ratchets for example are nothing like they used to be - draper etc have all gotten cheaper in quality and price ive found.

For the price of a Snap On box off the dealer, you may be able to find an older second hand unit WITH tools on eBay.