​How to “pick” the right business to stick to

I’m torn between two business ventures. I have money for both (up to £50k) however how do I choose between them. One which I know would be more “appropriate” in the sense of it would benefit the more corporate side of businesses, as it’s basically starting my own accountancy agency. My other is a more creative idea which not everyone would use but is something I’m still passionate about, it leans more towards spirituality and designing/creating my own products. Ideally I would do both, but while I’m still working a 9-5 I wouldn’t be able to commit to two businesses. What would be a fellow business owners advice in terms of which route to take – at least to start of.