Is Ferrari the best car in formula one?

Ferrari have won more F1 races and constructors championships than any other team in history, but they've also entered more races. If we consider a success rate to be the ratio of race wins to race entries:

Team Lotus and Williams ~15%

McLaren and Red Bull ~20%

Ferrari~25%

Mercedes >50% virtually all of these in the last 7 years

Ferrari still lead in constructors championships, 16 overall, with McLaren, Williams and Team Lotus behind. Mercedes have equalled Team Lotus with 7, again all won in the last 7 years.

It was in the past but Mercedes was better in 2020.

No where near. Mercedes are currently dominating the sport. Red Bull Racing second. Ferrari are currently do what ferrari historically have always done. Bad management, lack of good leadership and the italian way help them lose their way, trying to get back to the top they chop and change too much causing more instability and hold them back. They need another strong leader who they are willing to give time to. No co-incidence their best period was when Luca Di Montezemolo and Jean Todt were running things.

Weasel, McLaren haven't won a title since 2008. They had Renault engines last year and have only just returned to mercedes.

I'm assuming you mean the Mercedes team. McLaren and Mercedes are 2 different teams

Not at the present time, 

The best? PH, I don't really know enough about racing to be able to say, YES. ;-)