It's no more a problem, as with any well serviced route, in any other country.. DEL is a busy airport, so sometimes getting a landing spot at peak hours can be problem, which means, flights can get a little late.. Though that shouldn't affect your choice of airlines, as all of them will have to deal with it.. So AI is a good choice..

But if timing is your biggest concern, you might wanna consider switching to Indigo.. They are better are on time performance than any other airline in India.. It's an LCC, but the seating will be pre assigned, and at a small cost you can choose to have the fire exit seat and food served to you... it's a very good option..

As mentioned earlier by jasepl, you are allowed one check in baggage, without additional cost, one hand bag and one laptop bag, all free.. This is applicable for all 3 airlines (Indigo and Spice allow 20 kgs check in, while AI i think allows 25kg or 30 kg)..

Enjoy..