Usually broadcom chip devices are favoured, as these seem to perform overall the best in stability and performance, even on ECI cabinets.
Zyxel devices are commonly broadcom so are a popular choice by Kitz community members, although perhaps differences in the preferred Zyxel model.
Billion 8800NL I also remember serving me well which is also broadcom based. Although by todays standards the wifi on it will be dated.
I tended to use my billion/zyxel in bridge mode, so in effect the main concern was the DSL chipset, and profile of the device.