Subvention of CLP which option is preferred for property?

Subvention or CLP to buy property. 5% buyer - 80 % - Home loan institute - 15% buyer- 1) In subvention it is Rs 1500 SQ FT more expensive + floor rise in short about 15% expensive then CLP. 2) Builder on Triparty agreement is writing will cover loan until Dec 2019 as possession date, but if this is delayed then he covers this by a letter stating he will pay EMI interest to me and I can pay this to bank. 3) I have some money with me which can last me for 1 and half year if I go with CLP. I would prefer to use this money for some investments then CLP. This money can earn to cover the difference between subvention and CLP. But later since this is 3 years for posession I have to take loan in CLP this will hit my salary account but I can afford them with pinch of salt every month. In CLP all my savings will be gone and nothing with me left.. 4) My question is: a) which route shall i take - CLP over subvention -In case I have some amount in hand then I can earn money to pay the differential cost easily as upfront when subvention is over. b) if project is delayed than even if i have letter from builder will this letter stand against any legal action for any unfortunate event c) What about taxation - if he pays me interest in my account and i have to pay this to home loan bank- will this be counted as additional income and charged to me at my tax slab - or i can setoff this against my loan EMI d) What other challenges do u see? I would appreciate your response on the same.. what do i choose finally.