When to stay and when to switch
If what you need is invoicing, accounting and a light CRM, Holded is among the best you can find in Spain. The interface is good, support delivers and the price is reasonable. Don't change just for the sake of it.
If your business spends half a working day every day on parallel tools to cover the operation (clinical agenda, routines, attendance, ROs, progress photos, whatever), it's time for a system that covers both halves. Building it custom costs more at the start, but the constant double-clicking between 4 tools stops existing.