What buyers in Portugal are actually deciding
The most common way a Portuguese CRM project goes wrong is a misunderstanding about scope. Someone assumes that because the system holds customers and prices, it will produce the invoice, and the project stalls once it becomes clear that invoicing here has to come from software approved for that purpose. Deciding the boundary at the start turns that from a problem into an ordinary integration.
The rest of the decision is familiar: whether the pipeline can be seen, whether follow-up happens without depending on memory, and whether the customer relationship belongs to the company or to the salesperson holding the phone. Those are the questions a trial should answer, and they can be answered in a fortnight.
Sales system and fiscal system are different jobs
This separation is often treated as an inconvenience and is actually a benefit. Your invoicing software is set up to satisfy rules that change; your CRM is set up to help people sell. Keeping each doing its own job means neither has to be compromised, and the only requirement is that customer details pass cleanly between them.
An hour is enough to break a calendar
Mainland Portugal does not sit on central European time, and software that assumes it does will put reminders and reporting periods an hour out. People notice quickly, stop trusting the schedule, and revert to their own notes. Check it in the first hour of any trial.