If it is the case that during Haydh a woman cannot pray and the Thawab of reciting the Quran is less then does it not imply that a man has more of an ability to pray and accumulate Thawab and therefore be granted Jannah as compared to a woman?
The reward of the believers who do good does not depend on the quantity but the quality of worship. Quality of worship depends on the degree of sincerity and dedication to Allah (SWT). Woman during menstruation gets reward for every good deed she does and gets also compensation for the suffering of menstruation. That will make her reward not less that the reward of pious men who do good. There is no question of any discrimination between man and woman in front of Allah (SWT) who created both of them and granted them equal chances and help to do good.
'Wassalam.