The short answer
Based on available data, the Alpina B8 comes out ahead of the BMW M8 on power. Check the specs table and owner sentiment below for the full comparison before deciding between the two. Both are covered by real owner reports on CarWizz.
Overall
Owner sentiment is highly fragmented due to discussions covering two distinct generations separated by decades. For the classic E36-era B8 (based on the 3 Series), sentiment among long-term owners is heavily focused on maintenance, with the vehicle described as a "very rare 330ci" that requires diligent, specialized upkeep. The car is praised for its "magical" Alpina-tuned suspension offering a supple yet sporty ride.
Best version to buy
Insufficient owner data available to designate a best version. For the classic E36, one owner strongly recommends retaining all Alpina-specific parts, especially the springs, for the intended driving experience.
Known issues
Overall
Mixed sentiment with a clear divide between appreciation for its capabilities and criticism of its character. The vehicle is widely acknowledged as extremely fast, comfortable, luxurious, and built to a high quality with tight assembly tolerances. It is consistently described as an excellent grand tourer that does everything well, offering a blend of performance, technology, and daily usability.
Best version to buy
Insufficient owner data available to declare a consensus "best" version (e.g., Coupe vs. Gran Coupe, Competition vs. base).
Known issues
The verdict
The Alpina B8 is the better choice for most buyers.
It has more power on its best-equipped version than the BMW M8, based on the data above. If efficiency matters more to you than outright power, the BMW M8 is worth a closer look instead.
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Owner reports show similar reliability sentiment for the Alpina B8 and the BMW M8. Check the known issues listed above for specific differences between the two.
Data on family-specific factors like cargo space is limited for one or both models, but based on available reports, both are positioned as practical daily drivers. Check the specs table above for seating and body type.
Fuel consumption data is limited for one or both models. Check the specs table above for the figures available on each catalogued version.
Exact maintenance costs aren't in our data, but reliability signals above are the closest proxy: fewer reported issues generally means lower repair costs over time.