French is an extremely easy language to pick for someone who already speaks English.
In fact, English took from French over 30% of its vocabulary. French was the official language in England of the highly educated until mere centuries ago.
Most researchers in France already speak English.
The huge advantage of the US/UK is one: money, you could become rich and apply your ideas to real products(in a bigger market) much much more easily than in France.
The huge advantage of France: quality of life.