MP/MLA's for development or for parties?

Am still confused on this one. On what basis do we select our MP's or MLA's? On the basis of how they ersonally are or on the basis of which party they represent? Should I be voting for my constituency or should I be keeping national interests in mind? What to do with people who fit the title 'Right person in wrong party'. Should they suffer cause of their party or should party win cause of them? I know ideally it can be said that party is formed from them only so a right person will help form a right party. But this is not the case always.
So what exactly was the 'spirit of the constitution' when creating such a post? What i believe, it must have been for selecting the best people from all over India without any concept of parties or concept of abiding by party decision when you personally disagree. But its obvious that in such a system no leader can enjoy stability. But am sure it wasnt the purpose of constitution to elect puppets for the parties who are bound to it. Especially with Anti Defection Law in place you just cant afford to disagree with your party. But if they only wanted puppets then why have them even. Just ask people to vote for parties and they'll select some person for each constituency.
There was another issue I was thinking about and that was about how to ensure that a person can fight election with a limited amount of resources. It was more of ensuring that a person having more resources dont have so much advantage as a normal person. For guys in college it was like a government decision to make JEE paper such that difference between those going to coaching and those not able to access coaching have minimal difference while attempting the paper. Obviously there will always be a difference, coaching will give some advantage but the aim was to make it minimal. Similarly we need a way to ensure that more resources dont translate into much more votes in elections. Will write about this in another post.
For now still thinking what is the purpose of MP's/MLA's or whether I vote for the parties.
Anyone having any ideas??