give more details like, office as in nasa office lang and laging nakasaksak sa outlet? hindi laging dinadala outside?
if yes, then you can go for more powerful laptops so it can handle more tasks (i.e. i5 processor, higher RAM, SSD HDD, with switchable or just discrete graphics)). if lagi namang dadalhin sa labas then go for something that will be more power efficient so you can use it longer (i.e. pentium or i3 processor, shared graphics)
as for brand, any of the known brands will do, just avoid brands like blue and neo dahil madaling uminit ang mga yan kahit nasa office lang. sa office ng asawa ng kakilala ko puro neo gamit nila dati, wala pang 1 year (so under warranty pa) mga 3 units ata ng neo ang nasira due to overheat. buti nalang at that time yung kakilala ko may computer shop pa and sila ang nag supply so hindi namoblema sa warranty claims. pero ever since then, hindi na nagdala ng neo yung kakilala ko sa shop until na nagsara yung shop (nag migrate sa japan dahil descendant pala yung asawa)