H and V Sped Rating On Tires

Have a 2005 Accord, 6 cyl. Live in New England.
A general question re the H or V speed rating on passenger "all season"
Everything else remaining the same,is there any difference in snow conditions, or on ice, for one rating over the other for the same model tire ?
e.g., might the different compound in one be softer, and thus "a bit" better on snow or ice ?
And, is the H or V for a tire usually embossed on the sidewall ? Is there some code for, or is an actual H or V there (or somewhere) ?
Thanks, Bob
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