a very interesting question and huge amount of answers and rankings....
my ranking:
Plastic figures
1) Zvezda - all their sets were incredible good and historical precise sculpted, but unfortunatly they don´t produce any affordable and good figures - their small box-figures in new 3D-Design are mostly lifeless
- and Valdemar which makes resin- and not plastic figures
2) Revell - nearly all sets were outstanding, but they have finished to produce any figures before WW2
3) Italeri although a good third of their Napoleonics are bad and oversized sculpted, but they don´t produce any new figures besides reissues and game-sets
4) Waterloo
5) Strelets and Redbox for their new figures since 2015 and their policy to continue new sets of certain periods and conflicts - you don´t have to wait decades to get the wished opponents
6) Hät which has really the far biggest range of figures, but only 40 percent of their sets are outstanding sculpted - they have switched often their sculpture styles, plastic quality and figure proportions ... and have reduced painful the number of different figure-poses ...some of their best sets are given us a mission impossible to achieve straight arms or rifles ... and they let us quite often wait many years to continue their periods and themes. I am waiting for my Placenoit Project already 6 years to get their many years ago announced new Prussian Landwehr and French Line Infantry
7) Esci, Matchbox and Airfix which were a beloved part of my childhood and youth
8 Pegasus and Caesar which make really good figures but unfortunatly not for my choosen periods
9) Miniart and Emhar
...
99) Mars for the ugliest figures ever produced in 1/72 which have occupied very long one of my favourite periods, the 17th century, so only very few producers have produced any figures for this time - a curse which was only recently broken from Redbox
Metal figures
1) Art Miniaturen/Schmäling and Franznap
2) Frank Ziegler Miniaturfiguren and Imperial Modellbau
3) Hagen Miniatures, Fritz Figures, Daydream Miniatures, Schilling and Kamar
4) Tumbling Dice, Newline, Early War Miniatures