Poms lost 4-0 in IND, Aussies can do at worst is 4-0 in 4 Test Series.
Poms made 1-1 in Bangladesh, which I think is going to be tougher for us against Starc & Hazlewood
AUS lost 3-0 in SRL, not sure how Poms will do there, but their recent Asian tour suggests, it won't be much better than 0-3
Aussies crashed WI 2-0 & 2-0 both home & away - would have required to bat half innings 3 times out of 4, had they wished; Poms couldn't hang on to 1-0 lead in that 1-1 Series in WI
Poms drew 2-2 against PAK at home, Aussies have so far beaten PAK & weather for a 2-0 lead
Poms managed to draw 1-1 against Kiwis at home, AUS won both series home & away, by clear margin of 2-0 & 2-0
Poms beat an under strength SAF 2-1 in SAF, who later beat AUS 2-1 in AUS - we'll have to wait for SAF's summer tour, before that Poms has slight edge; though Poms lost last home 3 Test Series to SAF 2-0, AUS drew 1-1 in SAF
Poms beat AUS 3-2 at home in last Ashes, Aussies won the previous one 5-0 at home & most likely to repeat again in a years time
In between, Poms managed to win & lose a Series to SRL at home.
I am not sure, how ENG is a better team than NZ or PAK, let alone SAF, IND & AUS - based on their one Series win in SAF?