Checking the EUR to KES rate is one thing; sending money is another. Grey adds three costs to a transfer, a deposit fee, a conversion fee and a send fee, and shows every one of them with the exact shilling amount your recipient receives before you confirm.
Because Grey does not add a margin to the exchange rate on top of the stated fees, the figure to compare is simple: the exact shilling amount for a transfer from EUR to KES, shown before you confirm. Your recipient can receive shillings in an M-Pesa wallet linked to a Safaricom number, or in an account at Equity Bank, KCB Bank, Co-operative Bank, NCBA or Standard Chartered Kenya.