IMO.....ANY API (American Petroleum institute) NLGI (National Lubricating Grease Institute).
Traditionally, a grease's stiffness is indicated by its penetration value and is evaluated using the
standardized National Lubricating Grease Institute (NLGI) grade chart. The NLGI number is a measure of the grease's consistency as indicated by its worked penetration value.
There are nine different NLGI “grades” including 000, 00, 0, 1, 2, 3, 4, 5 and 6. ... The correct NLGI grade is an important consideration because
not all grease applications are the same. Some grease applications require softer grease so it can be pumped easily through small distribution lines and valves.
This subject is akin to which oil is best, which spark plugs are best, which wax is best, which beer is best, etc. I guess the "best type" is user determined, based on operating conditions, availablity, cost, and ease of application but should be based on OEM recommendations. Just my opinion of course.
BOB RENTON