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" tires:
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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