Runescape is one of the largest MMO games in the world at present. For RS3 and OSRS, many players are more familiar with OSRS. Runescape is RS3, and OSRS appears after RS3. So what's the difference between them?
In terms of game technology, Old School Runescape is relatively advanced. Since OSRS receives support from third-party clients, it is difficult for RS3 to compete with OSRS even if it performs well.
RuneLite is the most popular and best performing OSRS client and Jagex supports RuneLite. While RuneLite and 3rd parties bring tons of features, from graphics upgrades to quality of life features and more, some things are server-dependent or engine-dependent and can't be tweaked by anyone other than Jagex.
Many of the features of modern games aren't available in Old School Runescape, but OSRS has far more tweaks and plugins than Runescape 3 in terms of game features. Any kind of interface tweak that you want to give you any kind of information you might want is likely to be available in RuneLite.
Microtransactions, Lootboxes, and Monetization
Players can subscribe to Runescape to enjoy both Runescape 3 and Old School Runescape. Old School Runescape has no microtransactions, no loot boxes, and the game is free. A lot of content is restricted beyond membership, but you can easily play 100 hours of Old School Runescape on a free account.
Old School Runescape monetization is a bond. Players can use OSRS Gold or real money to buy and sell OSRS Items in the game, which you can apply to your account to become a premium member. This means it's entirely possible to never have to pay for Runescape and still enjoy the full paid game, as long as you spend a few hours per month farming gold.
However, since you can buy bonds with cash and trade or sell them, you can buy gold directly from Jagex. However, the price difference is huge, and if you don't want to overpay, you can at least save a ton of cash by Buy OSRS Gold from an out-of-game service like RPGStash.
The price of RS Gold is affected by the market, but RPGStash will always be lower than the market price through discounts. Not only that, by becoming a member, you will enjoy more discounts and even free benefits, which is very worthwhile.