Well I've had the HTR+ before, and I just got the ST-115 recently. I would go for the Falken if you don't need the winter capabilities of the HTR+. They are a decent all season tire, but I think the Falkens handle better in the dry, and they are very quiet. I just autocrossed on them yesterday and they gripped a lot better than I imagined they would. If you are going to autocross regularly though I would spring for the Azenis Sport or the Kumho MX.
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