which engine to default to post jade?

The issue has been brought up with the renaming of jade: if we have to change the _default engine_ away from jade, which engine should it be? There are three main contenders, with, i.m.o. the main pro of each:
1. `pug`. pro: very similar language to `jade`
2. `hbs`. pro: this is an Express.js project
3. `ejs`. pro: it's a basic, flexible language
4. _no defulat_. pro: reduces reliance on external dependencies

Very old previous discussion: #47
Discussion on this in TC: https://youtu.be/bolB3vHBNK4 (it's the first topic)

Summary of votes from conversation below:
1. 1 (@jonathanong)
2. 2 (@dougwilson @joewagner)
3. 0
4. 4 (@ChiperSoft @hacksparrow @crandmck @gokaygurcan)

/cc @expressjs/express-tc