There's quite a few scales, there is no "most common". The original West End Games Star Wars Miniatures Battles from 1992 were roughly 1/72, which is 20MM gaming scale sometimes also called True 25mm because the figures are 25mm to top of head. Large amount of figs for the line, but only for Original Trilogy and early Expanded Universe stuff. Figures are all metal and often go for collectors prices
WotC had a small line of metals in heroic 28mm for the RPG in the early 2000s, followed by a huge line of pre-painted plastics for the Star Wars Miniatures line. This line covers the OT, prequels, video games and EU books, but they lost the license before the new trilogy came out so no New Order or Resistance figs were ever made in this scale. They're technically collectors items and were sold in random packs like card games with commond and uncommons and rares, so the commons are often available for cheap but the named characters can vary greatly and some go for quite a lot of money. Quality is also all over the place, some of the figures had incredible detail and could be repainted to look quite amazing, some were a half step up from a potato.
Knight Models had a line of truescale 32mm models. VERY nice sculpts, but they were too tall and thin compared to the WotC minis and too short and thin compared to later Legion miniatures. Very rare nowadays and they go for premium when they pop up on ebay.
Imperial Assault is a board game with board game-quality PVC plastic miniatures. They're [i]roughly[/] in scale with the WotC prepainted plastics but the scale is VERY inconsistent with some being way too tall or too short. They generally paint up well. They're recently OOP and still in many shops online, unfortunately they're a bit expensive sine they're sold with all the cards and tokens and such for the board game.
Star Wars Legion is the currently produced game form FFG (same company that made IA), focusing on unit combat with a few named heroes as commanders and special operatives. It's Heroic 1/48 scale, about a head taller than WotC/IA minaitures. They're made out of PVC similar to the IA boardgame figures with the vehicles and newer infantry in polystyrene/HIPS plastic. The IA figures were so varied that a few of them still work OK with Legion, and Legion figures have been much more consistenly scaled, but they're large enough that most of the old figures don't work very well alongside them.
If you don't own anything, I'd probably recommend Legion figures for wargaming, even if you use another rules system. If you just want RPG figures or some homebrew skirmish gaming then the WotC and IA figures mostly go OK together and there's MUCH more variety
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