There is no difinitive answer.
EGT probably comes before wideband. Unless you plan to do your own tuning, wideband is probably not as important and if you are tuning, you need both.
Here is my gauge list in order of preference... (Oil and clock on the dash, other 3 on the A-Pillar)
Boost
Oil Temp
Oil Pressure
EGT
Wide Band
Clock
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