The different wood types each have their own characteristic and appearance.
Wood is living material and it will continue to work as a result of seasonal and ambient temperature fluctuations and changes in humidity. Therefore, you can experience that your solid wood table might both expand and contract over time.
Beechwood is mostly uniform in color while the grains of the oak wood are often formed in distinct rings with clear-cut boundaries.
Regardless of the wood types, we recommend that you always maintain both treated and untreated wood with soap or oil to prevent the wood from drying out. If the wood dries out it can crack in the staves. Lacquered wood does not require maintenance.
NOTE - regarding solid wood:
Small knots, difference in colour, significant or insignificant growth rings in the wood as well as quarter sawn plates with markings are considered as a sign of authenticity not an error.