It is very true that Meguiars is a mediocre product line and optimum is the leader.
A no rinse wash and some sort of sealant is a good regimen. Keep in mind that without a coating a decontamination using clay or a chemical will need to be repeated several times a year.
A minimum routine is clay and decon every change of season. This is where a coating comes in. Some say that a coating is really expensive but in reality it is less expensive than wash, clay, and wax, 4 times a year.
Obviously if you wash and wax yourself you will spend very little but paint correction will need to be done on average once every year or every other which removes just a little bit of clear coat.
If you take your car to a pro it will be done to a higher standard and, of course much faster. If we compare wash, clay, wax 4 times a year to a coating the coating may cost $1500, but what will the wax cost? If you spend $600 a year having it done, in 3 years you will have spent $1800. That is only 3 years. 6 years would be $3600 and so on.
Just giving you something to think about. Happy detailing.