I am assuming any war with China will be a limited 2-3 week engagement. I do not think that neither China or India can fight an open-ended conventional all-out war. I am also assuming there would be no nuclear exchange - it is anyone's guess there. China will not be able to deploy all its forces as it will have to maintain a min deterrent posture along its East - particularly against Vietnam, Japan and SoKo.
As it stands to-day, in terms of pure conventional capability, for a 3-4 week war, here is the big picture:
India’s active military personnel around 1,325,000+add another 1,000,000 in paramilitary personnel (China - 2,255,000). When it comes to the ground forces is where I need others to chip in here. I am sure, we lag behind in the arty pieces, but Brahmos and Pinaka give India a qualitative edge. Indian MRLS+MBTs+SPs+AIFVs+APCs+Vintage Tanks+others put together is around 8000 pieces. Indian army perhaps is the most battle-hardened Army in the world today - several low intensity conflicts, IPKF, Kargil, etc. Here, India retains a serious edge in terms of the quality of its personnel and the ability to 'hit the ground running'.
Please fill in on deployed Agnis+Prithvis+ etc. I have a strong feeling that Chinese missile capability in terms of numbers is far superior to ours as it stands to-day - this is what probably makes an imbalance in favor of China.
?? Add nascent Indian BMD to the mix, along with better quality and high precision missiles
IAF has 3382 aircraft which includes 1335 combat aircraft operating from possible 334+ bases (China’s PLA Air Force has 9,218 aircraft of which about 2300 are combat aircraft, operating from its possible 489+ air bases). Indian Air Force, has Mirage 2000s, Jaguars and Russian Su-30 MKI .The air superiority in China’s PLAAF is maintained by its fleet of Russian Su-30 MK and indigenously built J-10/11/B fighters. On the Airforce balance, India probably has an edge due to qualitatively better aircraft and 'professional' personnel.
Indian Navy - world’s 8th largest navy with a with a fleet of 145 vessels consisting of and Aircraft Carrier, missile-capable warships, advanced submarines, the latest naval aircrafts and an aircraft carrier in its inventory. (China’s PLA Navy with its fleet of 284 vessels - 1 Aircraft Carrier not yet deployed). Indian Navy certainly has a qualitative edge due to its operational and deployment experience and can choke off key trade routes to China in a limited 3-4 week conflict.
Please chip in here and lets analyze this further.