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I'd pick both... Because they both render things so differently
I agree on the need for both. But it's not quite that simple. There's not just the issue of 5 and 5.5 but which service packs to use! Currently, I have 5 with sp 2 and 5.5 with service pack 1. Are those reasonable choices? (Is it worth my while to also be checking 5 with sp1 and 5.5 with sp 2?)
The service packs addressed security issues(and other problems)
I understand the principle. But when I discover something won't function/render with service pack 1 but is fine with #2, that means. . .?
In other words, what are the "other problems"? (since it doesn't seem like a "security issue" would explain such behavior)