I applied evisa in hcmc for myself and in person at taiwan for dependants. Differences evisa takes longer (expect 1.5 weeks) where as taipei took 3 days. Evisa was straight fwd, upload all the docs and that's it. In person they asked me qs like why am I applying in Taipei not hcmc.

Once approved it's not that different. Evisa you print out the email to hand over to immigration, in person they put a sticker in your passport