The Moulton Speed is much faster than any Brompton, its a real road bike, its also not separable (excepted a special series of separable Speed which are also heavier).

These two bikes are absolutely not comparable.

For the price, a complete Moulton Speed with Campagnolo Super Record components but standard Moulton wheels costed about 10K GBP in 2017, its about twice the current price of the T-line.