Others have already said this but I'll try to frame it a little differently. If this is for fun, then go for it. The choice of client is WOW TBC Gold purely personal. WotLK clients are the best, as they give you access to a variety of different tools and are able to be modified. Content is mostly identical, except for talent and capabilities.
If you're undertaking this huge project with the thought in mind of establishing a massive player base, then it's a waste of your time. The community isn't cheap WOW TBC Classic Gold awash with custom servers , and even If they did, their enthusiasm for new releases would lead them to consume your entire server in 3 months when it took at least 1+ years for it to be completed.