Selection of e-service systems architecture is important problem. One and the same e-service can be designed by using different alternative systems architectures. Each of these systems has its own execution estimation that is important for service provider and also for service receiver. This article gives comparison for two architecture selection methods. Selection of e-service systems architecture is based on multi-criteria optimization. The solution example is based on two practical e-services examples “To sign up to kindergarten queue” and “Advertisement/Signboard conformation”. Architecture optimization in examples uses five criteria (costs of production, time of execution, exploitation costs, reusability and integrity). Optimization in examples is done by two optimization approaches – calculating of Pareto optimum set and using of weighting method.