Many merits have been written about the Jurong West BTO sites, but let me downplay the location based on what I know.
1. The BTO site at Jurong West Street 93 is right beside the industrial area. The foreign workers community hub is at Soon Lee Street, and many foreign workers hang out around Pioneer Road North and Jurong West Street 93 area. Especially at night.
1b. Nearby is Jurong West Sports and Recreation Centre. On surface, it's good. But actually, after hours, this is where a lot of hanky-panky stuff may happen as this place is open to public 24/7 except for the paid areas, which is the swimming pool and the shops.
1c. This is one of the back alley of Jurong West.
1d. But the good point about this site is that it is next to a public swimming pool, a public gym, a public stadium, a public running track, and within walking distance (900m; 12mins walk from the furthest point) to Pioneer MRT Station, which are the merits of a condominium (near MRT, got swimming pool, got gym, etcetera.)
1e. But the setback, really, is the lack of security. It's next to the industrial area, and a lot of foreign workers hang out around Jurong West Street 93 and Pioneer Road North at night.
2. The BTO site at Boon Lay Way is at the junction of two main roads: Boon Lay Way and Jalan Boon Lay. Also, it is near to the MRT track. So, in terms of Feng Shui, there is very strong energy flow.
2b. The nearest bus stop would be the one along Boon Lay Way. 5 bus services connecting to Boon Lay Bus Interchange, but none of them is feeder, which means the frequency can be up to 20 minutes when you wait for a bus at Boon Lay Bus Interchange. The 5 bus services are 30, 154, 178, 180, 187. Of which 180 frequency is the highest (eg. 12 minutes after 7pm) among the 5 bus services. In comparison, feeder 240's frequency is 10 minutes after 7pm. Advice: take 180 when taking from Boon Lay Bus Interchange, unless next time got feeder bus serving that bus stop at Boon Lay Way.
2c. The negative point I want to write about this location is the main road. Because it's surrounded by main roads, you need to be extra cautious when crossing the road.
2d. Also, if you intend to walk between the Boon Lay Way BTO site and Boon Lay MRT Station, do take note that the area around Jurong Point is a smoking area, and it's not really a direct path from the taxi stand area of Jurong Point to Boon Lay MRT Station.
2c. Also, Boon Lay is one of the oldest neighborhood in Singapore. They are building new BTO flats in Boon Lay just to rejuvenate the area. The filthy areas are along Boon Lay Drive. Unless they site the multistorey carpark facing Boon Lay Drive, to filter out the negative energy, this is one bad point that prospective buyers should be aware of.
2d. There is an industrial area opposite the Boon Lay Way BTO site, but that one is managed by STK, a local company where most of the workers are locals.
2e. The foreign workers cluster is at Jurong Central Park and Boon Lay MRT Station area. Very few actually come to Boon Lay Drive area, probably because of the "barrier" formed by Boon Lay Way and the centrifugal force at Jurong Point area.
Conclusion: The BTO site at Boon Lay Way has better fengshui. But if you are looking for HDB that resembles condominium, and don't mind the lack of security, the BTO site at Jurong West Street 93 is better.