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Both tools sound really great in theory. I will definitely have them as they will help with simple onsite mistakes that can happen frequently. Especially, if you're working with huge and unstable websites where onsite errors might not even be your fault. In the case of online stores, TOOL 1 could prove to be really valuable. As you have thousands of pages and a platform that can literally do anything at any given time. If it can really notify that error quick enough that would be priceless. The second tool sounds awesome too. But I will go with the first one as it seems like an error prevention tool that will definitely be useful.