well...what kind of european school? in general, i would say stick with the better carib schools. sgu, ross, auc and saba have universal stateside approval, us clinicals, licensed grads in all states (well, maybe not saba yet, i don't know) and are familiar with what it takes to get grads back to the US and working.
the native european schools are going to do a great job also. you may miss out on lots of clinicals in the states and USMLE directed curriculum, but they will do a great job educating you, and you will not be a carib grad. that won't matter much to most folks in the job market, but some people prefer to avoid the carib. i am confident that if you do well, either group will be about the same for returning to the states.
basically, with the above you have to find your niche. do you want to get home as quick as possible, and have a US style education? go to the carib. do you want to live in europe, and have a totally new experience in addition to med school, at the expense of US clinicals and returning home a bit later? go to europe. at the end of your program, you will be pretty much equal in terms of hireablility from either the top carib schools or the native european schools. there are differences in strengths and weakness, but i think the overall applicant picture will be similar.
if you are speaking about the english programs in the central europe region, i would say that the above groups are better. but, the english programs can get you back and you can do well coming from here. but, be sure to go to a 6 year, CA approved school if you do decide to attend school in CE. there are several.