When I translate these sentences in my native language I don't feel any difference. Could you tell me these differences if they are?
It rains a lot in winter.
There is a lot of rain in winter.
Do you use both of them?
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There is no difference in meaning, and both are idiomatic.
From the perspective of style, which is of course opinion rather than objective, I prefer "It rains," both because it is slightly more concise and also because "there is" as a dummy subject is overused. But this does not affect the answer to your question, which is whether the two forms have any difference in meaning. No, they do not.