I've been using both for a few years. OpenAI's limits have always lasted much longer for me (depending on whether a monkey got in their machine or not). Aside from not lying about limits they also don't assume I'm developing some kind of nerve agent and lock me out when I ask basic questions in my domain or nag me about my late night work hours. There was a time last year when I strongly preferred using Anthropic models, but at some point something about the responses (or maybe the company) changed and I now find them particularly offputting relative to OpenAI. Hope they fix it because the industry needs more competition.