SPECS 
The Bugaboo Donkey is a favorite among parents but one draw back is that it's a bit wide at 23.6″ wide to 29″ wide and 29 Lbs in single mode and 34 lbs as double mode. In contrast the Mountain Buggy Duet is much smaller 
at 44.8"(L) x 25.5" (W) and weighs 32.4 Lbs.
Fold
Folded the Bugaboo Donkey is 20.5’’ x 23.6’’ x 36.6”. The fold is relatively easy and it is a one-piece fold and self standing. The duet also has an easy fold, it is compact at 35" (H) x 25" (W) x 12.5"(D) amd self standing.Donkey Seats
The Donkey has reclinable (3 positions) and reversible seats. Each seat is independant and you can choose the position of each one. The best part about the Donkey is that in 3 simple clicks allow the Bugaboo Donkey to change from a mono (single-mode) to a new full-size duo stroller and back just as easily. When in single mode parents have the option of using the side luggage basket to hold all your baby gear! Whether you have twins or children of various ages the donkey grows as you grow! It is suitable from birth and the 5 point harness does an excellent job at protecting your little ones! Both strollers are car seat and newborn compatible.
Duet Seats
The Mountain Buggy Duet is suitable for newborn to 4 years, twins or siblings and can be used as a single stroller, with the joey tote bag.The seats recline independently from a fully reclined position suitable for younger babies, to upright position perfect for older kids. The seats recline separately so each child can be on separate schedules with ease. Each seat back height is approximately 25.1 inches and can hold 39.6lb. The footrest is adjustable for maximum comfort.There is a quick twist and slide seat harness adjustment and a five-point harness . The seat liners are reversible and washable. Both strollers are car seat and newborn compatible.
Canopy
The Duet has a large spacious separate canopies with a peek-a-boo window and magnetic closure. The Canopies also have a flip out visors with SPF 50+ protection. The Donkey also has amazing canopies as well and very spacious with a zip up panel, They are both UPF 50.
Handlebars
They both have an adjustable handlebar. TheDuet handlebars are adjustable and ranges from 31 to 42 inches from the ground and the Donkey also has plenty of options for parents no matter their height.
DUET
Wheels
The Duet has 10” wheels with air-filled tires which makes every stroll comfortable and smooth. The Donkey can also handle multi-terrain and also has a two-wheel position.
DUET
DonkeyBrakes
The Duet has a hand-operated control brake as another form of braking and maneuvering as well as a regular footbrake. The Donkey has a very efficient footbrake.
Accessories
Bugaboo stacks up the Donkey and with the purchase of the Donkey parents get; the actual Chassis, 2 seats, 1 bassinet fabrics, 2 canopies, side luggage basket and a side luggage basket cover. The Mountain Buggy Duet has many accessories which can be sold separately which includes but is not limited to ; Mountain Buggy Duet 2019 Storm Rain Cover, Mountain Buggy Duet Sun Cover, Mountain Buggy Duet Carrycot Plus, ETC.
Storage
The Donkey not only has a large storage basket, it also has a side luggage basket to put everything you need and then some. The Mountain Buggy Duet under seat basket is spacious and can hold up to 11 lbs. There is also an organizer bag.
Price
The Mountain Buggy Duet starts at $699.99 and is a great investment for your growing family. The Donkey is right there with the Duet in terms of being a great investment. The Donkey ranges in price from $ 1,329 to $1,843.
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Bugaboo Donkey | Mountain Buggy Duet |
| Dimensions | 23.6″ wide to 29″ wide | 44.8"(L) x 25.5" (W) |
| Folded Dimensions | 20.5’’ x 23.6’’ x 36.6” | 35" (H) x 25" (W) x 12.5"(D) |
| Weight | 29 (single) lbs and 34 lbs (double) | 32.4 lbs |
| Weight Capacity | up to 37.5 lbs | 79 lbs |
| Wheel Size | 10″ and 12″ | 10" |
| Wheel Type | foam-filled tires | air-filled tires |
| Reversible Seat | ✓ |
Carrycot option: parent facing. Toddler Seat: world facing |
| Brake | Foot | Hand & foot |
| Adjustable Handlebars | ✓ | ✓ |
| Adjustable Leg rest | ✓ | ✓ |
| Recline | ✓ | Near Flat Recline |
| Head Height | 22" | 25.1 |
| How it doubles | side by side | Side by side |
| Included Accessories | Chassis 2 seats 1 bassinet fabrics 2 canopies side luggage basket side luggage basket cover | |
| Price | $1,694 | $699.99 |