The roast level changes the flavor focus and extraction rhythm of coffee beans. Light roasts usually retain more floral and fruity notes and bright acidity, medium roasts tend to show sweetness and balance, and dark roasts lean toward nuts, cocoa and a fuller body. There is no high or low among them; the key is whether they match the way you drink.

Espresso extraction focuses on the balance among dose, grind size, yield and time. Blend beans usually easily form a stable base of nuts, cocoa and caramel, while SOE more prominently highlights the aroma and sweet-tart character of a single origin. When choosing, first determine the drink, then decide whether you need stronger body or a clearer origin expression.

Around the direction of "whether SOE uses dark-roasted beans or light-roasted beans," you can first break the choice into several parts: flavor preference, commonly used equipment, drinking temperature and daily frequency of use. When sorting by roast level, it is worth first determining which item you care about more, then using the other conditions to filter. This way you can keep your individuality while also letting the beans show clear characteristics in actual brewing.

Qianjie Kaffa Forest often shows orange, ripe apricot and oolong tea sweetness, with a light mouthfeel, and the sweetness becomes more obvious as the temperature drops.

Qianjie Granja Estate Geisha has notes of orange blossom, guava, apricot and strawberry jam, with rich natural-process flavor, and is suitable for pour-over to observe its layers.

Qianjie Colombia Sidra has passion fruit, blueberry, grape and apricot flavors, with an obvious juicy character, and iced pour-over, cold drip and SOE can all present its aroma.

Besides flavor direction, the roast date and storage method of the beans also affect actual performance. After opening, coffee beans should be sealed as much as possible and kept in a cool, dry place; buying according to daily usage makes it easier to observe flavor changes. When brewing, first smell the dry aroma, then taste the entry, sweetness and finish; if the aroma is insufficient, you can check whether the grind is too coarse or whether the beans have been stored too long. For the same bean, the performance when hot and after adding ice or milk may also differ; after recording the parameters a few times, you can usually find the cup style that suits you better.

You can also consider "the flavors you like" and "the brewing difficulty you can accept" separately. Beans with obvious floral and fruity notes often require more careful control of water temperature, grind and pouring rhythm, while blends in the nut-and-cocoa direction are more suitable for daily drinking where stable output is sought. If several people at home drink coffee, first choose a balanced bean as a base, then add single-origin trials according to personal preference; this makes comparison easier than buying many beans of similar style at once.

For an espresso machine, you can first use a dose-to-yield ratio of about 1:2 as a starting point, then adjust the grind based on the acidity, bitterness and sweetness on entry. Sharp acidity usually requires extending the extraction or raising the temperature, while obvious bitterness can be addressed by shortening the extraction or making the grind coarser.

If the equipment you usually use, your drinking habits or your taste change, you can also divide the three beans into daily and exploratory categories: one responsible for stable output, and the other used to experience the differences brought by floral and fruity notes, nut-and-cocoa notes or processing methods. After determining the roast direction, fine-tuning through grind size, temperature and extraction time is often more effective than frequently changing beans.