Have no faith in tata.
To invest one's faith in a brand that hasn't been owned earlier is surely a tough task for anyone but it is also fact that car purchase decision is equally tough when you have multiple good performance products. With the limit set for the budget in your case, I would say, with my personal experience too, that Tigor petrol top spec is worth the price.
Lastly, like you and me there are many first time buyers here who have opted for TML cars and if their initial experience is referred to then I feel, there isn't any harm in giving a chance to TML as well buddy. In the end, it is you who has to be absolutely convinced of where to invest your money as to have the best possible vehicle for yourself.
Regards
Akash