Best answer is neither. The paccars are boat anchor wallet drainers in the best case unless you maintain them correctly from day 1…which most dont. And even then they are underpowered garbage well reviled for emissions issues, a locked down computer and extreme parts cost. The blocks themselves however do tend to make it to a million miles without needing a rebuild.
ISX is also crap. They usually dont last past 500-600K without needing a bunch of engine parts and/or a rebuild and even my shop guy says for every paccar that vomits up a crank he is replaceing 5 blown ISX blocks (though for every bad isx emissions system he is doing 15 paccars so eh) and i tend to belive him since he almost always has at least 1 or 2 ISX motors with holes in them in the bone yard. They however are typically far cheaper to get parts for and work on plus you can actully get the #### software for them. They do break down a lot though.
So honestly dealers choice on what set of issues you want. The issue here is both trucks your looking at are high miles, likely high price, judgeing on your post likely banged up and your going to be lucky to get 200K out of either one before your dumping 20-50K on a rebuild or a ton of parts.
Best bet is either save up more and get newer 250kish miles rig. Or go old iron and learn to work on it yourself. Otherwise with us heading towards a recession and likely depression, a huge downturn in freight, massivly inflated truck prices, low parts avalibility and layoffs/strikes already happening and a lot of bottom feeders in a race to negitive rates….not a great time to get in without either a fat as hell “oh ####” account or a rock solid new unit and a rock solid business plan with the skills to unbork your own crap. Going cheap is going to bite both cheeks along with your line and tackle off.
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