I'm still rooting for a wind logia. I like them the most and they are still the most powerful branch of DFs, we just haven't seen more than the bare minimum up until now, whereas Zoans and paramecias are fully fleshed out.
A logia, if it's in the realm of possibility -natural elements/substances-, will always be far superior to an alternative paramecia fruit. What's better than controlling wind, is becoming one with the wind besides just controlling it. Logias can do what paramecias can do and more. Same goes for a potential storm paramecia. Why not make it a storm logia, similar to Aramaki, who's also a forest logia and not a wood logia. You get all the benefits and more without any drawback whatsoever.
Same problem I have with mythical Zoans, that have access to elemental powers, like a potential Thunderbird DF would have. These abilties are just a side dish then and it's a matter of fact, that no one would give a damn about some occasional lightning or wind attacks then, just like no gives a damn about Kaido's boro breath or his weather moves. Dragon would end up being a low budget Kaido even and also far too similar to Mars in that case.
Storm or wind logia is where the money's at imo.