I've experienced both front loaders and US-type top loaders and I have generally found front loading machines tend to produce better results more reliably.
The problem I've noticed with US front loading machines is that they are actually too big. This is a marketing issues more than a technical one.
I've used typical US top loading machines (an old Whirlpool in Boston and a 230V SpeedQueen in Ireland) and they really didn't take amazingly huge loads compared to a modern 8-9kg European machines. You can pack a European machine quite tightly and it will still wash the load very well. Where as if you pack a top loading agitator machine too tightly it just doesn't work as there it needs much more space to move the clothes through the water.
Also, as top loaders are trying to achieve less and less water usage, they simply don't work effectively. A TL machine cannot wash if there's a very low water level. The same is not true for a front loader. It will just take a lot longer to wash with less water, but it will still achieve a good result.
I also found that TL machines produced problems with lint which I have never ever experienced with a Euro FL machine. Shirts occasionally came out coated dark lint. I think this is simply due to the high levels of mechanical action vs the slow tumbling action. FL machines just don't cause lint to come off the clothes in the first place.
I also think that a lot of US front loaders are impractically big. If you have a tightly filled drum, it will wash and not go out of balance. If you have a huge drum that has a load of towels in it, the machine will end up having trouble balancing and I have noticed that seems to happen a lot on typical over-sized US FL machines.
There's an optimum size and it's bigger than a typical Euro traditional 5kg machine but it's smaller than some of the crazy sized machines that certain US manufacturers are pushing too.
The 8kg-10kg large Euro models seem to kinda fit the bill perfectly in my experience.
The problem I've noticed with US front loading machines is that they are actually too big. This is a marketing issues more than a technical one.
I've used typical US top loading machines (an old Whirlpool in Boston and a 230V SpeedQueen in Ireland) and they really didn't take amazingly huge loads compared to a modern 8-9kg European machines. You can pack a European machine quite tightly and it will still wash the load very well. Where as if you pack a top loading agitator machine too tightly it just doesn't work as there it needs much more space to move the clothes through the water.
Also, as top loaders are trying to achieve less and less water usage, they simply don't work effectively. A TL machine cannot wash if there's a very low water level. The same is not true for a front loader. It will just take a lot longer to wash with less water, but it will still achieve a good result.
I also found that TL machines produced problems with lint which I have never ever experienced with a Euro FL machine. Shirts occasionally came out coated dark lint. I think this is simply due to the high levels of mechanical action vs the slow tumbling action. FL machines just don't cause lint to come off the clothes in the first place.
I also think that a lot of US front loaders are impractically big. If you have a tightly filled drum, it will wash and not go out of balance. If you have a huge drum that has a load of towels in it, the machine will end up having trouble balancing and I have noticed that seems to happen a lot on typical over-sized US FL machines.
There's an optimum size and it's bigger than a typical Euro traditional 5kg machine but it's smaller than some of the crazy sized machines that certain US manufacturers are pushing too.
The 8kg-10kg large Euro models seem to kinda fit the bill perfectly in my experience.