Best place to visit ?

There is not one place that is objectively better to visit than another.  Some people want one kind of experience and some people want another.  It depends upon what you like to do.  It also depends upon the time of year as the weather in the two places you mention are very different.

Los Angeles is more or less a suburban experience but with some aspects of an urban one.  There are many theme parks and amusement parks, art museums and other cultural events, the Griffith Observatory, as well as the beach and the hills to hike in.  If you go to Los Angeles, though, be prepared to sit in a lot of traffic as you drive from one end to the other.  It's very spread out and the roads are very crowded.

Maine has some small cities but it is more of a rural experience.  It too has the ocean (although too cold for swimming in my opinion) and an awful lot of beautiful country to look at.  There is Acadia National Park (incredible!), lighthouses and quaint villages, etc. etc.  On the other hand, it gets really cold in the winter.  I would only want to visit Maine in the summer.  

Personally, I would go to Maine if I were you.  It's a whole state, and you can get a much wider variety of experience there than in Los Angeles.  At least, when you're in the car in Maine, you're driving someplace and seeing beautiful scenery.  In Los Angeles you'll be looking at an ugly freeway as you inch along in traffic.

Hope this helps.

You go to Maine to experience nature, you go to Los Vegas for the opposite.  So it depends entirely on which you prefer. 

You are comparing an entire state to one city.

I rather go to the state of Maine

I would prefer to go to Maine. I don't like big cities, they smell like piss and hot garbage. 

Worst place is Florida both Trump and DeSantis love that Covid so much that Florida is the Covid capitol of the swamp world .

That depends on your interests and personality. If you like nature and the outdoors, Maine. If you like cities and urban activities, Los Angeles. I've had fun in both places.