Congratulations on both admits! Before I share my perspective, please note that it's my own viewpoint, and yours might differ. Regardless, both schools are brilliant, so whichever you choose, you'll be in good hands.
Between ESSEC and ESADE, I believe ESADE would be a better choice. Your work country choice is a bit ambiguous, but working in France with no French knowledge is more challenging than working in Spain without Spanish knowledge. Why? Because France is predominantly French-led, with a majority of communication in French. Regardless of the job, your French knowledge in France will provide you an edge. That said, if you have decent French skills, go for ESSEC. Spain has a welcoming culture, making it easier to interact with Spanish locals even without Spanish skills. Not implying you don't need Spanish skills to work in Spain, but it's generally more international student-friendly than France based on my knowledge and observation.
Your choice of the UK as a work country is more challenging. The international landscape is increasingly competitive in the UK. I graduated from Warwick myself, so I know it's a highly competitive market. If you believe you're up for the challenge, regardless of the school you choose, you'll be okay. The visa sponsorship market is more competitive now, so tread carefully.
Congratulations again on your admits!
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