Monitor for Mac Book Pro

Question

What is the best large monitor (24"or 27") to use with my 2011 Mac Book Pro?

Answer 1

Your MacBook Pros both feature ThunderBolt outputs.
Most Monitors (even those over 1920 wide) with a Mini DisplayPort or full-size DisplayPort will plug right in and work, or work with a cable that costs under US$10 and does no conversion. They pick up a subset of the ThunderBolt port's signals and use it directly.
DVI displays up to 1920 wide and HDMI displays up to 1920 by 1080p can be generated with a simple adapter.
Wide (over 1920 wide) DVI Monitors will require an expensive (about US$100) adapter that regenerates a Dual-Link (with data lines doubled) DVI signal, and also require additional power from a USB pigtail connected to USB or a 5V power source.
HDMI wider than 1920 wide is complex, expensive, and trouble-prone. Some TV sets can produce a picture, but it will not be as crisp,  stable, or true-to-color  as on a display sold as a Monitor.
Analog VGA displays are not going to produce the crisp picture required. An adapter is required, and very high resolutions are very difficult to obtain at all.