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The eindecker would be the future of fighters but the German version suffered from serious handling problems. It fared very well initially due to its sycronized machine guns. The tri-wings also suffered from wing problems, some due to shoddy construction but there was an inherrent lift differential between the upper and lower wings (2.5 to 1). So it has to be the Bi-plane such as the D VII until materials technology could catch-up with stress demands
At least with a blown engine you had a chance of making a landing, but most times you die when there is structural failure. No WW1 aircraft was reliable on the level that we expect of aircraft today, and some were known to be almost deathtraps.
When you read the day to day accounts of units at the front, or preparing to go to the front, you will notice lots of instances of wings folding, or someone being forced down because of engine failure. It took brave men to go up in those machines.
The excellent little 'Bullet'
I'm going to throw a spanner in the works and offer this in favour of the monoplane, purely as devil's advocate, of course. .....
Bingo!!