Com(.dll) versus Control(.ocx)

[DS]

I have an Access database for processing credit cards. There is a choice of
using .com(.dll) or Control (.ocx). Is here an upside or a downside in
using one or another? Is one more stable? Is one more vanilla than the
other? Also to take it a step further will Winhttp replace any of these?
Is Winhttp stable? Any Suggestions or comments welcomed. Thanks.
DS