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Interactive Brokers (IBKR) should have pretty much the most trading venues and very good (low) spreads.

Trade Republic is nice and clear to start with, but the 1€ trading fee is misleading about the actual costs, plus they have far too few stock exchanges.
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@Malte123 with TR you only trade via L&S, but the 1€😅... I think I once read that the prices are sometimes a little higher for this
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@TheAmazingInc Exactly, the so-called spreads, the difference between the official price and the price at which you buy.

Trade Republic certainly makes sense for the smallest amounts, but as soon as the amounts are somewhat larger/more normal, it is better to pay a little more order fee and buy at a better price.