Deciding on the ideal cocktail shaker is a personal matter, and you will become comfortable with any model you choose. If your concern is simply ease of shaking, a 3-piece shaker may be best. For experienced mixers who are looking for rapid application, a Boston shaker style system of capping a smaller tin or mixing glass is common, as is simply using a single tin for mixing and an ice strainer to separate the ice. 2-piece shakers are often sold as a set, and so often appearance is important as anything. If you want a bit of color and comfortable hold, you may want to try a Vinylworks™ shaker. Deciding metal or plastic is something to consider when budgets and show of both professionals and beginners are important.