Both are OK and mean the same thing.

Both are technically valid, and generally mean the same thing. The only difference is in their tone and flow when placed among other sentences. To decide which one is best to use, we would need to know the intended tone, the context and any surrounding text. Because, for example, if you use a lot of "at" words nearby, you might want to avoid saying "at" again unnecessarily within such close proximity, in order to ensure the best quality of writing. There are other subtle factors too - it all depends on context, surrounding text and intended tone. I repeat: neither is incorrect - they are both technically valid, and the difference in quality of writing is negligible except in cases of very strict readability, for example in high-profile marketing literature, and this level of scrutiny is bordering on the realm of poetics.

They are exactly the same