Surface care, you need to decide what options you need. For example I am only using Invoice and quote generator, customers details, turnover reports and marketing option with txt sending only, and cleanersmate fulfill all my needs here.
If the free version of get book up offers what I mentioned then probably its all you need for the start. If not, then I think gbu is more expensive so you need to think twice if the option offered is what you need.
You need txt message marketing option. Today after sending messages to the customers I have booked around 2k wort of work incl one commercial for 700, and rest of customers are having my details on the phone so once they ready to call and booked they no need to be looking after me, just to look into the message sent days ago. You cant let you customers to forget about you.