I am quite sure about my sources.
Rafale won L1 pricing fair and square. As per L1 winning bid was Rafale due to lower pricing and more mature tech mainly the Captor E AESA radar on the Eurofighter which even after several years is still undergoing 'fine tuning'. UK and Germany have no plans to buy them and are instead moving on with F 35. That one thing alone stacks development costs on us. Eurofighter tried to lowball the bidding at L1 but this being in violation of DPP 2013 was not considered.
Frankly nobody does as specifications have evolved since DPP 2013 to DPP 2016. Costing could change due to inflation, USD to INR, Oil Prices, working hours, production facilities, etc. Infact if more Rafales were to ordered, their unit cost will be cheaper as we have already made down payment for MKI-isation.
Going by figures we got the cheapest and best deal amongst all other customers with offsets, Make In India, MKI-isation. Even our current 36 fighter stopgap is much cheaper than Qatar even with a customised weapon package and modifications. Our MMRCA 126 jet deal would have broken the bank for future acquisitions.
https://economictimes.indiatimes.co...se-of-36-rafale-jets/articleshow/47168431.cms
https://www.indiatoday.in/mail-toda...re-french-aircraft-defence-1092384-2017-11-23
Su 30 MKI was designed off Su 37 which in turn made the Su 35BM. The only difference between the two platforms are engine, radar and cockpit. All these features and more will be retrofitted under Super Sukhoi deal. On a per unit cost, it is much cheaper to upgrade existing Su 30 MKI to Su 35BM than order an entirely new airframes as we would have to pay for R&D costs in addition to MKI-isation.
http://idrw.org/indias-super-sukhoi-su-30mki-to-get-su-57-technology/
http://trishul-trident.blogspot.com/2018/08/super-su-30mki-has-taken-shape.html
https://indianexpress.com/article/i...ay-in-sukhoi-rollout-raises-concerns-5381852/
Su 30 MKI infrastructure in India by HAL is already stretched to breaking point. They are unable to fulfil orders for 140 airframes and have to buy ready made fighters from Russia to meet quota. Even by unit cost, Su 30 MKI fighter made in India are more expensive than ones made in Russia. Russia also gouges out India for ToT and after sales support and with poor serviceability of these jets we have a top heavy air force. Thus we need more DRAL like units to have alternatives in private sector that are cheaper and deliver as well.
Su 30 MKI's major weakness is against S 300, S 400 style AA/AD systems that can make deep strike mission packages difficult unless mitigated by other ways. Rafale has a much lower RCS, has advanced RWR based SPECTRA EW suit and stealthy SCALP missiles which are cheaper than air launched BRAHMOS for strike missions. Su 35BM in a contested environment will have a tough time. That is why this will require Su 30MKI+ (Super Sukhoi) to act as bomb trucks while Rafale act as snipers and can call and guide missiles ahead of main force.
F 18 SH is the only aircraft capable of carrier flight that is tested and in production. I am not counting F 35C as that plane is essentially a bomb truck and not an air dominance fighter like F 18 SH. That's why USN is continuing to buy the planes in tandem with F 35C.
Producing carrier fighters in small batches like Mig 29K is an experiment that IN has already done and regrets deeply due to lack of after sales support and production infrastructure. Even Rafale had limited run in this department. Gripen N is still a concept with Brazilian Navy and is years away from even prototypes.