I liked Saleapaga - Faofao and Manusina Fales, neither was booked out in June/July /August.this year. I preferred Tafatafa along the South coast on Upolu,further from the traffic and a nicer beach, my favourite there Moeaga Manaia is not on the internet phone (685)41736 but is mainly only busy on the weekend. there are 4 places in a row at Tafatafa, Vaiula is on the internet and popular with surfers but I found Moega Manaia cleaner
Over all I prefer Savaii, the only places I found booked out there were Lauiula at Lano and Satuiatua beach fales at Satuiatua.At Lano there are only 2 fale accommodations (Joelans & Lauiula) and Satuiatua just the one- Lauiula is my favourite fale in Samoa for value (70 tala inc breakfast & dinner ) and a great beach for swimming at all tides.
Manase has a strip off about 5 fale operators Tanus ,Janes and vacations are probably the most popular but seldom booked out - in fact Janes was very quiet this winter, there is normally room on the strip somewhere