Cyprus and Malta are the obvious choices for an EU national.
Cyprus is one hour ahead of Belgium. Malta is in the same timezone as Belgium.
Cyprus total tax is 12.50% corporate income tax and nothing more if you pay yourself dividends from the company. Slightly better weather and slightly lower costs of living than Malta.
Corporate tax situation in Malta is net 5% after you first pay 35% and then get 6/7th back after a few weeks or months. You can then pay yourself through a few different means, such as dividends from the required foreign holding company to avoid further tax.
It's easier to run a business Cyprus is than in Malta since there's only one layer to worry about, but you end paying 7.5% more tax. The tax savings of 7.5% in Malta can easily be consumed by the more complicated accounting and paperwork required for having two companies. Consider both options carefully.
Whatever you end up going for, discuss the specifics of your situation with a qualified tax adviser. It's easy to get swept away by short summaries and while they apply in most cases, each case is a little unique.