Le Meridien offers the best and most generous breakfast buffet and evening lounge food in KL, bar none. In fact, it has the most generous lounge offering I have come across in the SPG / Marriott system. The evening lounge offering rotates daily, so you will get Chinese, Indian, Italian, Malay and others, depending on what day of the week you are there. The JWM is more generous than the Westin, but both fall short of the LM.

If you don't score an upgrade, however, the rooms are among the smallest by KL standards, and it sounds like you are planning to hang out at the hotel a bit. If space is important to you, the Westin, JW and Sheraton have far bigger rooms (I haven't stayed at the others on your list).

As [MENTION=163708]EuropeanPete[/MENTION] said, I recommend that you venture further afield, as there is a lot of good food available in KL.

If you are planning on restricting yourself to within a walking distance's radius of your hotel, your best choices would be the Sheraton and the JWM / Westin (which are next to each other). There are excellent hawker choices (and a lot of them!), in air-conditioned comfort, in Lot 10 Hutong just by the Westin and JWM. Sheraton and the Stripes are by "the Row" and a bunch of old school local eateries in the neighbourhood bordered by Jalan Dang Wangi and Jalan Raja Abdullah. Some of them, such as the very famous Yut Kee, jumped the shark years ago but still manage to attract a healthy queue every weekday lunchtime. KL Sentral, where the LM and the Aloft are located, is a foodie wasteland.

If you are open to leaving KL and exploring the scene in dynamic emerging townships such as TTDI, Damansara, Petaling Jaya, etc., KL Sentral is your best possible base as it is located on the edge of the city boundary, meaning it's easy to get a Grab (our local equivalent of Uber) out of there without getting stuck in a massive traffic jam trying to get out of the CBD (where the Sheraton / Stripes, Westin / JWM and Renaissance are located).