You can consider LDA colony, New Hyderabad and even Kaiser Bagh if you are seeking to invest in residential real estate in central Lucknow. Yes as far as commercial of industrial usage is concerned both these areas are a good deal because they provide good access to amenities and are well connected to all parts of the city.
I think comparing Meena bagh and Aish bagh regions is totally unjustified as both have a different segment and their own plus points and negative points. As rightly mentioned by the above member, both these regions are not ideal for residential apartments or any kind of residential real estate activity
While Meena bagh is a famous commercial center, Aish bagh is one of the most well known industrial centers of the city. If you are seeking to invest in an industrial plot of commercial land or shop, you can consider either of the areas according to your branch of business and trade.
You have not mentioned what kind of investment are you thinking of. If you are planning to invest in residential apartments I suggest you to stay away from both these areas as they have been traditional commerce centers of Lucknow with not many residential options available.