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can you tell me which derailleur is suitable for the kind of gear i want to use?
Hmmm, Shimano seem to have abandoned making MTB RDs for men, looks like you're going to have to suck up the price of the road levers if you want 11-speed and a 34T low. There's a Metrea (SL-U5000) lever which is readily available as RH only for about half the price of a pair of SL-RS700 which will work with the RD-R7000-GS RD or RD-RX800-GS if you think a clutch is a worthwhile thing, those seem to be the two 11-speed RDs optimised for a 34T low without going up to Ultegra or DA
MTB is probably going to be cheaper, the flat-bar road shifters are expensive, partly because they just are and partly because it's not easy to get right hand one without also being stuck with the left hand one.