Major Site Plan Review notes consideration of:
1. Siting of facilities;
2. Sustainable, climate-sensitive, and environmentally conscious site design practices;
3. Open space, natural features, and the landscape, emphasizing the function of natural, aesthetic, social, and reactional design;
4. Ecosystem function;
5. Circulation and connectivity that is safe and accessible for all;
6. Effective and efficient transportation systems and the adverse impacts of motor vehicle transportation;
7. Protection of surface and ground water quality;
8. Social, equity, diversity, public health, or community needs and impacts;
9) Historic significance
10) Impacts on public services and facilities;
11) Signage;
12) Safety; and
13) Potential adverse effects of development.
Special Permit notes consideration of:
1. Dimensional standards more restrictive than those set forth in § 135-4.0;
2. Screening or landscaping of principal or accessory uses from view from adjoining lots or from a street, by planting, walls, fences or other devices; planting of larger planting strips, with more or larger plant materials or higher walls or fences than that required in § 5.3;
3. Modification of the exterior features or appearance of a building or structure;
4. Limitations on the size, number of occupants or employees, method or hours of operation, extent of facilities or other operating characteristics of a use;
5. Regulation of the number, design and location of access drives or other traffic features of the proposed use;
6. Provision of a greater number of off-street parking spaces or loading bays, and with greater yard setbacks, landscaping and screening than the minimum standards set forth in § 5.1;
7. Limitations on the number, location, type and size of signs or illumination, or modification of the design features thereof;
8. Limitations on construction activities, such as but not limited to, the hours during which construction activity may take place, the movement of trucks or heavy equipment on or off the site, and measures to control dirt, dust, and erosion and to protect existing vegetation on the site;
9. Requirements for independent monitoring, at the expense of the applicant, and reporting to the Building Commissioner, if necessary to ensure continuing compliance with the conditions of a special permit or of this bylaw;
10. Limitations on the period of time the special permit shall be in effect; and
11. Such other limitation as may be reasonably related to reducing any adverse impact on, or increasing the compatibility of the proposed use, structure or activity with, the surrounding area.
To my read, in some (important) ways Major Site Plan Review seems perhaps stronger (but perhaps only broader?) with consideration of "potential adverse effects of development" and " community needs and impacts", even if Special Permit Approval allows for some more specifics such as ability to enforce "dimensional standards more restrictive".
With counsel's input that an application cannot be denied for frivolous reasons in either process, I'm still trying to work through what changes in development outcomes might result from each.