Welcome to the forum Ali. If you had a great deal of time on your hands to way through the great number of my posts, you will conclude that I'm one eyed regarding Makita routers. I have stated MANY times that those who are serious about routing and can afford one, Makita is THE one. You may have noticed that the three answers to your questions are from Aussies, who take routing very seriously. The 3612 that you mention has unfamiliar letters after the number so I don't know if it has variable speed and soft start like our 3612C, but even if it's fixed speed, it's a GREAT router. I'm not familiar with the 1/4" one but being Makita it's bound to be quality.
Nothing but heaven itself is better than a friend who is really a friend. - Plautus