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See I would go with the $5 one with the thought process that almost no establishment let’s you charge under $5, so if I ever saw something for less than that it would immediately be a redflag.
Half my CCs don’t let me set transaction alerts for less than $5-$10, so a $1 or less charge would never notify me, I’d have to be actively checking it every moment of every day to see it immediately.
And yes, I have email/text alerts when possible for every. single. charge. on my CCs at the lowest threshold possible and it has helped at least three times thus far.