Some background first. The EASA requirements for an MCC course are 25 hours of theoretical training and 20 hours of practical training in at least an FNPTII simulator. The competencies to be achieved are set out in AMC1 FCL.735.
The most basic MCC courses just satisfy the minima. Others take the view that the 20 hour course just begins to scratch the surface and design longer courses, the extra element is called a Jet Orientation Course (JOC) and is completely unregulated by the CAA. Obviously you pay more for more hours, but the thinking is that you get a course that better prepares you for employment and which increases your chance of both initial selection for interview and actually getting through. Most airlines now insist on more than a bare MCC course, some identify either hours minima or specific MCC/JOC providers. Finally, different providers have different training philosophies, some MCC/JOC courses are to an extent modelled on type rating training, others ignore the type as far as it possible and concentrate on Cockpit Resource Management (CRM) training that would apply to all types.
The top end providers include a lot more than most, in particular extra ground elements of non-technical core competencies (such as training on the commercial aspects of aviation, team building, leadership, management & communication, professionalism & the pilot's role, knowledge & standards (SOPs), diagnosis & decision making, workload management, customer service and non-normal event handling. These will not all be taught on all courses, the best providers will teach it all and teach it well) They will also include employment selection screening - interviews, team exercises, solo exercises - to identify pilots that meet their high standards and enable them to go to the airlines and say 'this pilot has been trained in core competencies and their operating skills assessed, and would be suitable for recruitment.' The airlines like this because they have neither the time nor the resources to put each applicant through a 40 hour sim phase and all the non-technical training. If they are convinced by the provider's training and selection program they give priority to their pilots when recruiting. They will always also interview and quite probably sim check even these applicants. The existing providers that do this in the list above are CTC with their ACQ program and Kura. Each has links to airlines that they feed the successful pilots into. All this costs money - hence the higher prices.
To answer your specific question, the Alliance program starts with selection, then there is a two week course of non-technical and technical training (including all the above) first by distance learning then concluding with 4 days in the classroom, then the sim phase. After the sim phase there is a 2 day advanced pilot core competencies course (not included in the above table). Once an airline is identified there is further airline specific selection training. In these respects it is substantially the same as Kura's and CTC's courses.
Ultimately you should choose the course that suits you best!