A made to measure suit program gives the consumer a high degree of control. You choose the fabric, buttons, lapels, pockets, lining, and so on. The amount of control will vary from program to program. Some may allow you a choice of only a few options, while others are more comprehensive and may offer up to 15 or more choices on details.
The good? More control, higher quality, a more custom fit.
The bad? A bit more expensive, 4-8 week delivery time, plus allowances for any alterations needed once the garment arrives and you are fitted.